51662641 has 2 divisors, whose sum is σ = 51662642. Its totient is φ = 51662640.

The previous prime is 51662617. The next prime is 51662671. The reversal of 51662641 is 14626615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 38416 = 7185^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 51662641 - 2¹⁵ = 51629873 is a prime.

It is not a weakly prime, because it can be changed into another prime (51662671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831320 + 25831321.

It is an arithmetic number, because the mean of its divisors is an integer number (25831321).

Almost surely, 2^51662641 is an apocalyptic number.

It is an amenable number.

51662641 is a deficient number, since it is larger than the sum of its proper divisors (1).

51662641 is an equidigital number, since it uses as much as digits as its factorization.

51662641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 51662641 is about 7187.6728500955. The cubic root of 51662641 is about 372.4421867245.

The spelling of 51662641 in words is "fifty-one million, six hundred sixty-two thousand, six hundred forty-one".