51245545 has 8 divisors (see below), whose sum is σ = 66225096. Its totient is φ = 37842816.

The previous prime is 51245539. The next prime is 51245561. The reversal of 51245545 is 54554215.

It can be written as a sum of positive squares in 4 ways, for example, as 4678569 + 46566976 = 2163^2 + 6824^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51245545 - 2¹¹ = 51243497 is a prime.

It is a super-2 number, since 2×51245545² = 5252211764694050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394132 + ... + 394261.

It is an arithmetic number, because the mean of its divisors is an integer number (8278137).

Almost surely, 2^51245545 is an apocalyptic number.

It is an amenable number.

51245545 is a deficient number, since it is larger than the sum of its proper divisors (14979551).

51245545 is a wasteful number, since it uses less digits than its factorization.

51245545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788411.

The product of its digits is 20000, while the sum is 31.

The square root of 51245545 is about 7158.5993741793. The cubic root of 51245545 is about 371.4371788298.

The spelling of 51245545 in words is "fifty-one million, two hundred forty-five thousand, five hundred forty-five".