51531757 has 2 divisors, whose sum is σ = 51531758. Its totient is φ = 51531756.

The previous prime is 51531749. The next prime is 51531769. The reversal of 51531757 is 75713515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38180041 + 13351716 = 6179^2 + 3654^2 .

It is a cyclic number.

It is not a de Polignac number, because 51531757 - 2³ = 51531749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51531737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765878 + 25765879.

It is an arithmetic number, because the mean of its divisors is an integer number (25765879).

Almost surely, 2^51531757 is an apocalyptic number.

It is an amenable number.

51531757 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531757 is an equidigital number, since it uses as much as digits as its factorization.

51531757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18375, while the sum is 34.

The square root of 51531757 is about 7178.5623212451. The cubic root of 51531757 is about 372.1274012507.

The spelling of 51531757 in words is "fifty-one million, five hundred thirty-one thousand, seven hundred fifty-seven".