51629929 has 4 divisors (see below), whose sum is σ = 55601476. Its totient is φ = 47658384.

The previous prime is 51629909. The next prime is 51629933. The reversal of 51629929 is 92992615.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29680704 + 21949225 = 5448^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 51629929 - 2¹⁹ = 51105641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51629909) 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, 1985754 + ... + 1985779.

It is an arithmetic number, because the mean of its divisors is an integer number (13900369).

Almost surely, 2^51629929 is an apocalyptic number.

It is an amenable number.

51629929 is a deficient number, since it is larger than the sum of its proper divisors (3971547).

51629929 is a wasteful number, since it uses less digits than its factorization.

51629929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971546.

The product of its digits is 87480, while the sum is 43.

The square root of 51629929 is about 7185.3969271015. The cubic root of 51629929 is about 372.3635618813.

The spelling of 51629929 in words is "fifty-one million, six hundred twenty-nine thousand, nine hundred twenty-nine".