51696929 has 4 divisors (see below), whose sum is σ = 54417840. Its totient is φ = 48976020.

The previous prime is 51696919. The next prime is 51696971. The reversal of 51696929 is 92969615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92969615 = 5 ⋅18593923.

It is a cyclic number.

It is not a de Polignac number, because 51696929 - 2⁴ = 51696913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51696919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1360427 + ... + 1360464.

It is an arithmetic number, because the mean of its divisors is an integer number (13604460).

Almost surely, 2^51696929 is an apocalyptic number.

It is an amenable number.

51696929 is a deficient number, since it is larger than the sum of its proper divisors (2720911).

51696929 is a wasteful number, since it uses less digits than its factorization.

51696929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720910.

The product of its digits is 262440, while the sum is 47.

The square root of 51696929 is about 7190.0576492821. The cubic root of 51696929 is about 372.5245639402.

It can be divided in two parts, 51696 and 929, that added together give a palindrome (52625).

The spelling of 51696929 in words is "fifty-one million, six hundred ninety-six thousand, nine hundred twenty-nine".