231361553 has 2 divisors, whose sum is σ = 231361554. Its totient is φ = 231361552.

The previous prime is 231361513. The next prime is 231361567. The reversal of 231361553 is 355163132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161086864 + 70274689 = 12692^2 + 8383^2 .

It is a cyclic number.

It is not a de Polignac number, because 231361553 - 2²⁰ = 230312977 is a prime.

It is not a weakly prime, because it can be changed into another prime (231361513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115680776 + 115680777.

It is an arithmetic number, because the mean of its divisors is an integer number (115680777).

Almost surely, 2^231361553 is an apocalyptic number.

It is an amenable number.

231361553 is a deficient number, since it is larger than the sum of its proper divisors (1).

231361553 is an equidigital number, since it uses as much as digits as its factorization.

231361553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 29.

The square root of 231361553 is about 15210.5737235648. The cubic root of 231361553 is about 613.8991945831.

The spelling of 231361553 in words is "two hundred thirty-one million, three hundred sixty-one thousand, five hundred fifty-three".