231997122 has 40 divisors (see below), whose sum is σ = 594111936. Its totient is φ = 66284568.

The previous prime is 231997069. The next prime is 231997127. The reversal of 231997122 is 221799132.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (231997127) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101158 + ... + 103425.

Almost surely, 2^231997122 is an apocalyptic number.

231997122 is an abundant number, since it is smaller than the sum of its proper divisors (362114814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231997122 is a wasteful number, since it uses less digits than its factorization.

231997122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204604 (or 204595 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 231997122 is about 15231.4517364564. The cubic root of 231997122 is about 614.4608242853.

The spelling of 231997122 in words is "two hundred thirty-one million, nine hundred ninety-seven thousand, one hundred twenty-two".