51429931 has 4 divisors (see below), whose sum is σ = 58777072. Its totient is φ = 44082792.

The previous prime is 51429919. The next prime is 51429943. The reversal of 51429931 is 13992415.

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

It is an interprime number because it is at equal distance from previous prime (51429919) and next prime (51429943).

It is a cyclic number.

It is not a de Polignac number, because 51429931 - 2²¹ = 49332779 is a prime.

It is a super-2 number, since 2×51429931² = 5290075605329522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51429901) 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, 3673560 + ... + 3673573.

It is an arithmetic number, because the mean of its divisors is an integer number (14694268).

Almost surely, 2^51429931 is an apocalyptic number.

51429931 is a deficient number, since it is larger than the sum of its proper divisors (7347141).

51429931 is an equidigital number, since it uses as much as digits as its factorization.

51429931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347140.

The product of its digits is 9720, while the sum is 34.

The square root of 51429931 is about 7171.4664469688. The cubic root of 51429931 is about 371.8821335260.

The spelling of 51429931 in words is "fifty-one million, four hundred twenty-nine thousand, nine hundred thirty-one".