231641089 has 2 divisors, whose sum is σ = 231641090. Its totient is φ = 231641088.

The previous prime is 231641077. The next prime is 231641147. The reversal of 231641089 is 980146132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177102864 + 54538225 = 13308^2 + 7385^2 .

It is a cyclic number.

It is not a de Polignac number, because 231641089 - 2¹⁹ = 231116801 is a prime.

It is a super-2 number, since 2×231641089² = 107315188226211842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231641489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115820544 + 115820545.

It is an arithmetic number, because the mean of its divisors is an integer number (115820545).

Almost surely, 2^231641089 is an apocalyptic number.

It is an amenable number.

231641089 is a deficient number, since it is larger than the sum of its proper divisors (1).

231641089 is an equidigital number, since it uses as much as digits as its factorization.

231641089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 231641089 is about 15219.7598207068. The cubic root of 231641089 is about 614.1463371417.

The spelling of 231641089 in words is "two hundred thirty-one million, six hundred forty-one thousand, eighty-nine".