51442661 has 2 divisors, whose sum is σ = 51442662. Its totient is φ = 51442660.

The previous prime is 51442639. The next prime is 51442669. The reversal of 51442661 is 16624415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43428100 + 8014561 = 6590^2 + 2831^2 .

It is a cyclic number.

It is not a de Polignac number, because 51442661 - 2⁶ = 51442597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51442669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25721330 + 25721331.

It is an arithmetic number, because the mean of its divisors is an integer number (25721331).

Almost surely, 2^51442661 is an apocalyptic number.

It is an amenable number.

51442661 is a deficient number, since it is larger than the sum of its proper divisors (1).

51442661 is an equidigital number, since it uses as much as digits as its factorization.

51442661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 51442661 is about 7172.3539371674. The cubic root of 51442661 is about 371.9128139031.

The spelling of 51442661 in words is "fifty-one million, four hundred forty-two thousand, six hundred sixty-one".