231497290 has 16 divisors (see below), whose sum is σ = 420992712. Its totient is φ = 91643904.

The previous prime is 231497281. The next prime is 231497293. The reversal of 231497290 is 92794132.

It can be written as a sum of positive squares in 4 ways, for example, as 212022721 + 19474569 = 14561^2 + 4413^2 .

It is not an unprimeable number, because it can be changed into a prime (231497293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118359 + ... + 120298.

Almost surely, 2^231497290 is an apocalyptic number.

231497290 is a deficient number, since it is larger than the sum of its proper divisors (189495422).

231497290 is a wasteful number, since it uses less digits than its factorization.

231497290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238761.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 231497290 is about 15215.0349983166. The cubic root of 231497290 is about 614.0192268345.

The spelling of 231497290 in words is "two hundred thirty-one million, four hundred ninety-seven thousand, two hundred ninety".