51321528961 has 2 divisors, whose sum is σ = 51321528962. Its totient is φ = 51321528960.

The previous prime is 51321528941. The next prime is 51321529019. The reversal of 51321528961 is 16982512315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26035758736 + 25285770225 = 161356^2 + 159015^2 .

It is a cyclic number.

It is not a de Polignac number, because 51321528961 - 2⁹ = 51321528449 is a prime.

It is not a weakly prime, because it can be changed into another prime (51321528911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660764480 + 25660764481.

It is an arithmetic number, because the mean of its divisors is an integer number (25660764481).

Almost surely, 2^51321528961 is an apocalyptic number.

It is an amenable number.

51321528961 is a deficient number, since it is larger than the sum of its proper divisors (1).

51321528961 is an equidigital number, since it uses as much as digits as its factorization.

51321528961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 43.

The spelling of 51321528961 in words is "fifty-one billion, three hundred twenty-one million, five hundred twenty-eight thousand, nine hundred sixty-one".