231215669 has 2 divisors, whose sum is σ = 231215670. Its totient is φ = 231215668.

The previous prime is 231215659. The next prime is 231215683. The reversal of 231215669 is 966512132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196840900 + 34374769 = 14030^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 231215669 - 2⁴ = 231215653 is a prime.

It is a super-2 number, since 2×231215669² = 106921371182235122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231215609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115607834 + 115607835.

It is an arithmetic number, because the mean of its divisors is an integer number (115607835).

Almost surely, 2^231215669 is an apocalyptic number.

It is an amenable number.

231215669 is a deficient number, since it is larger than the sum of its proper divisors (1).

231215669 is an equidigital number, since it uses as much as digits as its factorization.

231215669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 231215669 is about 15205.7774875210. Note that the first 3 decimals coincide. The cubic root of 231215669 is about 613.7701369832.

The spelling of 231215669 in words is "two hundred thirty-one million, two hundred fifteen thousand, six hundred sixty-nine".