51797881 has 2 divisors, whose sum is σ = 51797882. Its totient is φ = 51797880.

The previous prime is 51797873. The next prime is 51797897. The reversal of 51797881 is 18879715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 1032256 = 7125^2 + 1016^2 .

It is a cyclic number.

It is not a de Polignac number, because 51797881 - 2³ = 51797873 is a prime.

It is a super-2 number, since 2×51797881² = 5366040952180322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51797821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25898940 + 25898941.

It is an arithmetic number, because the mean of its divisors is an integer number (25898941).

Almost surely, 2^51797881 is an apocalyptic number.

It is an amenable number.

51797881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51797881 is an equidigital number, since it uses as much as digits as its factorization.

51797881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 46.

The square root of 51797881 is about 7197.0744750906. The cubic root of 51797881 is about 372.7668906944.

The spelling of 51797881 in words is "fifty-one million, seven hundred ninety-seven thousand, eight hundred eighty-one".