51431613 has 16 divisors (see below), whose sum is σ = 76432320. Its totient is φ = 30571776.

The previous prime is 51431563. The next prime is 51431629. The reversal of 51431613 is 31613415.

It is a de Polignac number, because none of the positive numbers 2^k-51431613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51431663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25570 + ... + 27507.

It is an arithmetic number, because the mean of its divisors is an integer number (4777020).

Almost surely, 2^51431613 is an apocalyptic number.

It is an amenable number.

51431613 is a deficient number, since it is larger than the sum of its proper divisors (25000707).

51431613 is a wasteful number, since it uses less digits than its factorization.

51431613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53116.

The product of its digits is 1080, while the sum is 24.

The square root of 51431613 is about 7171.5837163070. The cubic root of 51431613 is about 371.8861875786.

The spelling of 51431613 in words is "fifty-one million, four hundred thirty-one thousand, six hundred thirteen".