231251117 has 2 divisors, whose sum is σ = 231251118. Its totient is φ = 231251116.

The previous prime is 231251107. The next prime is 231251143. The reversal of 231251117 is 711152132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166384201 + 64866916 = 12899^2 + 8054^2 .

It is a cyclic number.

It is not a de Polignac number, because 231251117 - 2²⁰ = 230202541 is a prime.

It is a super-2 number, since 2×231251117² = 106954158227495378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231251092 and 231251101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231251107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115625558 + 115625559.

It is an arithmetic number, because the mean of its divisors is an integer number (115625559).

Almost surely, 2^231251117 is an apocalyptic number.

It is an amenable number.

231251117 is a deficient number, since it is larger than the sum of its proper divisors (1).

231251117 is an equidigital number, since it uses as much as digits as its factorization.

231251117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 23.

The square root of 231251117 is about 15206.9430524350. The cubic root of 231251117 is about 613.8015013686.

It can be divided in two parts, 23125 and 1117, that added together give a palindrome (24242).

The spelling of 231251117 in words is "two hundred thirty-one million, two hundred fifty-one thousand, one hundred seventeen".