51909629 has 2 divisors, whose sum is σ = 51909630. Its totient is φ = 51909628.

The previous prime is 51909607. The next prime is 51909661. The reversal of 51909629 is 92690915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43586404 + 8323225 = 6602^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 51909629 - 2⁸ = 51909373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51909329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25954814 + 25954815.

It is an arithmetic number, because the mean of its divisors is an integer number (25954815).

Almost surely, 2^51909629 is an apocalyptic number.

It is an amenable number.

51909629 is a deficient number, since it is larger than the sum of its proper divisors (1).

51909629 is an equidigital number, since it uses as much as digits as its factorization.

51909629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 51909629 is about 7204.8337246601. The cubic root of 51909629 is about 373.0347654515.

The spelling of 51909629 in words is "fifty-one million, nine hundred nine thousand, six hundred twenty-nine".