231057551 has 2 divisors, whose sum is σ = 231057552. Its totient is φ = 231057550.

The previous prime is 231057503. The next prime is 231057559. The reversal of 231057551 is 155750132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231057551 is a prime.

It is a super-3 number, since 3×231057551³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231057559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115528775 + 115528776.

It is an arithmetic number, because the mean of its divisors is an integer number (115528776).

Almost surely, 2^231057551 is an apocalyptic number.

231057551 is a deficient number, since it is larger than the sum of its proper divisors (1).

231057551 is an equidigital number, since it uses as much as digits as its factorization.

231057551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 231057551 is about 15200.5773245624. The cubic root of 231057551 is about 613.6301951450.

The spelling of 231057551 in words is "two hundred thirty-one million, fifty-seven thousand, five hundred fifty-one".