51501413 has 4 divisors (see below), whose sum is σ = 51726540. Its totient is φ = 51276288.

The previous prime is 51501409. The next prime is 51501433. The reversal of 51501413 is 31410515.

51501413 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.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 25877569 = 5062^2 + 5087^2 .

It is a cyclic number.

It is not a de Polignac number, because 51501413 - 2² = 51501409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501433) 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, 112220 + ... + 112677.

It is an arithmetic number, because the mean of its divisors is an integer number (12931635).

Almost surely, 2^51501413 is an apocalyptic number.

It is an amenable number.

51501413 is a deficient number, since it is larger than the sum of its proper divisors (225127).

51501413 is a wasteful number, since it uses less digits than its factorization.

51501413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225126.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51501413 is about 7176.4484949033. The cubic root of 51501413 is about 372.0543456464.

Adding to 51501413 its reverse (31410515), we get a palindrome (82911928).

The spelling of 51501413 in words is "fifty-one million, five hundred one thousand, four hundred thirteen".