51005245 has 4 divisors (see below), whose sum is σ = 61206300. Its totient is φ = 40804192.

The previous prime is 51005209. The next prime is 51005249. The reversal of 51005245 is 54250015.

51005245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54250015 = 5 ⋅10850003.

It can be written as a sum of positive squares in 2 ways, for example, as 29964676 + 21040569 = 5474^2 + 4587^2 .

It is a cyclic number.

It is not a de Polignac number, because 51005245 - 2¹³ = 50997053 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100520 + ... + 5100529.

It is an arithmetic number, because the mean of its divisors is an integer number (15301575).

Almost surely, 2^51005245 is an apocalyptic number.

It is an amenable number.

51005245 is a deficient number, since it is larger than the sum of its proper divisors (10201055).

51005245 is a wasteful number, since it uses less digits than its factorization.

51005245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10201054.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51005245 is about 7141.7956425538. The cubic root of 51005245 is about 370.8556893759.

It can be divided in two parts, 51005 and 245, that multiplied together give a square (12496225 = 3535²).

The spelling of 51005245 in words is "fifty-one million, five thousand, two hundred forty-five".