231415291 has 2 divisors, whose sum is σ = 231415292. Its totient is φ = 231415290.

The previous prime is 231415277. The next prime is 231415297. The reversal of 231415291 is 192514132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231415291 is a prime.

It is a super-2 number, since 2×231415291² = 107106073817229362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231415297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115707645 + 115707646.

It is an arithmetic number, because the mean of its divisors is an integer number (115707646).

Almost surely, 2^231415291 is an apocalyptic number.

231415291 is a deficient number, since it is larger than the sum of its proper divisors (1).

231415291 is an equidigital number, since it uses as much as digits as its factorization.

231415291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 231415291 is about 15212.3400895457. The cubic root of 231415291 is about 613.9467207179.

The spelling of 231415291 in words is "two hundred thirty-one million, four hundred fifteen thousand, two hundred ninety-one".