231491253 has 16 divisors (see below), whose sum is σ = 364913280. Its totient is φ = 127718976.

The previous prime is 231491243. The next prime is 231491287. The reversal of 231491253 is 352194132.

It is not a de Polignac number, because 231491253 - 2⁴ = 231491237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231491253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231491243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189450 + ... + 190667.

It is an arithmetic number, because the mean of its divisors is an integer number (22807080).

Almost surely, 2^231491253 is an apocalyptic number.

It is an amenable number.

231491253 is a deficient number, since it is larger than the sum of its proper divisors (133422027).

231491253 is a wasteful number, since it uses less digits than its factorization.

231491253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380156.

The product of its digits is 6480, while the sum is 30.

The square root of 231491253 is about 15214.8366077326. The cubic root of 231491253 is about 614.0138893115.

The spelling of 231491253 in words is "two hundred thirty-one million, four hundred ninety-one thousand, two hundred fifty-three".