51642457 has 2 divisors, whose sum is σ = 51642458. Its totient is φ = 51642456.

The previous prime is 51642443. The next prime is 51642529. The reversal of 51642457 is 75424615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30702681 + 20939776 = 5541^2 + 4576^2 .

It is a cyclic number.

It is not a de Polignac number, because 51642457 - 2²³ = 43253849 is a prime.

It is not a weakly prime, because it can be changed into another prime (51642407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821228 + 25821229.

It is an arithmetic number, because the mean of its divisors is an integer number (25821229).

Almost surely, 2^51642457 is an apocalyptic number.

It is an amenable number.

51642457 is a deficient number, since it is larger than the sum of its proper divisors (1).

51642457 is an equidigital number, since it uses as much as digits as its factorization.

51642457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 34.

The square root of 51642457 is about 7186.2686423484. The cubic root of 51642457 is about 372.3936774462.

The spelling of 51642457 in words is "fifty-one million, six hundred forty-two thousand, four hundred fifty-seven".