231356173 has 2 divisors, whose sum is σ = 231356174. Its totient is φ = 231356172.

The previous prime is 231356119. The next prime is 231356197. The reversal of 231356173 is 371653132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191185929 + 40170244 = 13827^2 + 6338^2 .

It is a cyclic number.

It is not a de Polignac number, because 231356173 - 2²¹ = 229259021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231356273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115678086 + 115678087.

It is an arithmetic number, because the mean of its divisors is an integer number (115678087).

Almost surely, 2^231356173 is an apocalyptic number.

It is an amenable number.

231356173 is a deficient number, since it is larger than the sum of its proper divisors (1).

231356173 is an equidigital number, since it uses as much as digits as its factorization.

231356173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 31.

The square root of 231356173 is about 15210.3968718768. The cubic root of 231356173 is about 613.8944360810.

The spelling of 231356173 in words is "two hundred thirty-one million, three hundred fifty-six thousand, one hundred seventy-three".