51652981 has 2 divisors, whose sum is σ = 51652982. Its totient is φ = 51652980.

The previous prime is 51652967. The next prime is 51653027. The reversal of 51652981 is 18925615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35892081 + 15760900 = 5991^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 51652981 - 2⁵ = 51652949 is a prime.

It is a super-2 number, since 2×51652981² = 5336060892372722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51652981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51652901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25826490 + 25826491.

It is an arithmetic number, because the mean of its divisors is an integer number (25826491).

Almost surely, 2^51652981 is an apocalyptic number.

It is an amenable number.

51652981 is a deficient number, since it is larger than the sum of its proper divisors (1).

51652981 is an equidigital number, since it uses as much as digits as its factorization.

51652981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 37.

The square root of 51652981 is about 7187.0008348406. Note that the first 3 decimals coincide. The cubic root of 51652981 is about 372.4189719106.

The spelling of 51652981 in words is "fifty-one million, six hundred fifty-two thousand, nine hundred eighty-one".