231391151 has 2 divisors, whose sum is σ = 231391152. Its totient is φ = 231391150.

The previous prime is 231391129. The next prime is 231391159. The reversal of 231391151 is 151193132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231391151 - 2¹⁰ = 231390127 is a prime.

It is a super-2 number, since 2×231391151² = 107083729522209602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231391151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231391159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115695575 + 115695576.

It is an arithmetic number, because the mean of its divisors is an integer number (115695576).

Almost surely, 2^231391151 is an apocalyptic number.

231391151 is a deficient number, since it is larger than the sum of its proper divisors (1).

231391151 is an equidigital number, since it uses as much as digits as its factorization.

231391151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 26.

The square root of 231391151 is about 15211.5466340540. The cubic root of 231391151 is about 613.9253721010.

The spelling of 231391151 in words is "two hundred thirty-one million, three hundred ninety-one thousand, one hundred fifty-one".