51321413 has 24 divisors (see below), whose sum is σ = 63859680. Its totient is φ = 40772160.

The previous prime is 51321401. The next prime is 51321421. The reversal of 51321413 is 31412315.

It is not a de Polignac number, because 51321413 - 2⁸ = 51321157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34595 + ... + 36047.

It is an arithmetic number, because the mean of its divisors is an integer number (2660820).

Almost surely, 2^51321413 is an apocalyptic number.

It is an amenable number.

51321413 is a deficient number, since it is larger than the sum of its proper divisors (12538267).

51321413 is a wasteful number, since it uses less digits than its factorization.

51321413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509 (or 1496 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 51321413 is about 7163.8964956230. The cubic root of 51321413 is about 371.6203902067.

Adding to 51321413 its reverse (31412315), we get a palindrome (82733728).

The spelling of 51321413 in words is "fifty-one million, three hundred twenty-one thousand, four hundred thirteen".