231142889 has 2 divisors, whose sum is σ = 231142890. Its totient is φ = 231142888.

The previous prime is 231142841. The next prime is 231142903. The reversal of 231142889 is 988241132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227406400 + 3736489 = 15080^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 231142889 - 2¹² = 231138793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231172889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115571444 + 115571445.

It is an arithmetic number, because the mean of its divisors is an integer number (115571445).

Almost surely, 2^231142889 is an apocalyptic number.

It is an amenable number.

231142889 is a deficient number, since it is larger than the sum of its proper divisors (1).

231142889 is an equidigital number, since it uses as much as digits as its factorization.

231142889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 231142889 is about 15203.3841298574. The cubic root of 231142889 is about 613.7057312006.

It can be divided in two parts, 23114 and 2889, that multiplied together give a triangular number (66776346 = T₁₁₅₅₆).

The spelling of 231142889 in words is "two hundred thirty-one million, one hundred forty-two thousand, eight hundred eighty-nine".