1657157231 has 2 divisors, whose sum is σ = 1657157232. Its totient is φ = 1657157230.

The previous prime is 1657157213. The next prime is 1657157239. The reversal of 1657157231 is 1327517561.

Together with previous prime (1657157213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1657157231 is a prime.

It is a super-2 number, since 2×1657157231² = 5492340176511174722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1657157239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828578615 + 828578616.

It is an arithmetic number, because the mean of its divisors is an integer number (828578616).

Almost surely, 2^1657157231 is an apocalyptic number.

1657157231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1657157231 is an equidigital number, since it uses as much as digits as its factorization.

1657157231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44100, while the sum is 38.

The square root of 1657157231 is about 40708.1961157701. The cubic root of 1657157231 is about 1183.3718626790.

The spelling of 1657157231 in words is "one billion, six hundred fifty-seven million, one hundred fifty-seven thousand, two hundred thirty-one".