51646951 has 2 divisors, whose sum is σ = 51646952. Its totient is φ = 51646950.

The previous prime is 51646949. The next prime is 51647009. The reversal of 51646951 is 15964615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51646951 - 2¹ = 51646949 is a prime.

Together with 51646949, it forms a pair of twin primes.

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 51646951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51646151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25823475 + 25823476.

It is an arithmetic number, because the mean of its divisors is an integer number (25823476).

Almost surely, 2^51646951 is an apocalyptic number.

51646951 is a deficient number, since it is larger than the sum of its proper divisors (1).

51646951 is an equidigital number, since it uses as much as digits as its factorization.

51646951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 51646951 is about 7186.5813152013. The cubic root of 51646951 is about 372.4044792086.

The spelling of 51646951 in words is "fifty-one million, six hundred forty-six thousand, nine hundred fifty-one".