51909953 has 2 divisors, whose sum is σ = 51909954. Its totient is φ = 51909952.

The previous prime is 51909947. The next prime is 51909989. The reversal of 51909953 is 35990915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 1329409 = 7112^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 51909953 - 2⁴ = 51909937 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51909953.

It is not a weakly prime, because it can be changed into another prime (51929953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25954976 + 25954977.

It is an arithmetic number, because the mean of its divisors is an integer number (25954977).

Almost surely, 2^51909953 is an apocalyptic number.

It is an amenable number.

51909953 is a deficient number, since it is larger than the sum of its proper divisors (1).

51909953 is an equidigital number, since it uses as much as digits as its factorization.

51909953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 51909953 is about 7204.8562095298. The cubic root of 51909953 is about 373.0355415632.

The spelling of 51909953 in words is "fifty-one million, nine hundred nine thousand, nine hundred fifty-three".