231165551 has 2 divisors, whose sum is σ = 231165552. Its totient is φ = 231165550.

The previous prime is 231165511. The next prime is 231165577. The reversal of 231165551 is 155561132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231165551 - 2²⁶ = 164056687 is a prime.

It is a super-3 number, since 3×231165551³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231165511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115582775 + 115582776.

It is an arithmetic number, because the mean of its divisors is an integer number (115582776).

Almost surely, 2^231165551 is an apocalyptic number.

231165551 is a deficient number, since it is larger than the sum of its proper divisors (1).

231165551 is an equidigital number, since it uses as much as digits as its factorization.

231165551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 29.

The square root of 231165551 is about 15204.1294061844. The cubic root of 231165551 is about 613.7257871133.

The spelling of 231165551 in words is "two hundred thirty-one million, one hundred sixty-five thousand, five hundred fifty-one".