231085571 has 2 divisors, whose sum is σ = 231085572. Its totient is φ = 231085570.

The previous prime is 231085549. The next prime is 231085579. The reversal of 231085571 is 175580132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231085571 is a prime.

It is a super-2 number, since 2×231085571² = 106801082248792082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231085579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115542785 + 115542786.

It is an arithmetic number, because the mean of its divisors is an integer number (115542786).

Almost surely, 2^231085571 is an apocalyptic number.

231085571 is a deficient number, since it is larger than the sum of its proper divisors (1).

231085571 is an equidigital number, since it uses as much as digits as its factorization.

231085571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 231085571 is about 15201.4989721409. The cubic root of 231085571 is about 613.6549988112.

The spelling of 231085571 in words is "two hundred thirty-one million, eighty-five thousand, five hundred seventy-one".