51700431 has 4 divisors (see below), whose sum is σ = 68933912. Its totient is φ = 34466952.

The previous prime is 51700427. The next prime is 51700457. The reversal of 51700431 is 13400715.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51700431 - 2² = 51700427 is a prime.

It is a super-2 number, since 2×51700431² = 5345869131171522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51700398 and 51700407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51700331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8616736 + ... + 8616741.

It is an arithmetic number, because the mean of its divisors is an integer number (17233478).

Almost surely, 2^51700431 is an apocalyptic number.

51700431 is a deficient number, since it is larger than the sum of its proper divisors (17233481).

51700431 is a wasteful number, since it uses less digits than its factorization.

51700431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17233480.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51700431 is about 7190.3011758896. The cubic root of 51700431 is about 372.5329754751.

The spelling of 51700431 in words is "fifty-one million, seven hundred thousand, four hundred thirty-one".