231953491 has 48 divisors (see below), whose sum is σ = 313709760. Its totient is φ = 167270400.

The previous prime is 231953479. The next prime is 231953503. The reversal of 231953491 is 194359132.

231953491 is a nontrivial binomial coefficient, being equal to C(21539, 2).

It is an interprime number because it is at equal distance from previous prime (231953479) and next prime (231953503).

It is not a de Polignac number, because 231953491 - 2⁹ = 231952979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231953491.

It is not an unprimeable number, because it can be changed into a prime (231953411) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1281421 + ... + 1281601.

It is an arithmetic number, because the mean of its divisors is an integer number (6535620).

Almost surely, 2^231953491 is an apocalyptic number.

231953491 is the 21538-th triangular number.

231953491 is the 7180-th centered nonagonal number.

231953491 is a deficient number, since it is larger than the sum of its proper divisors (81756269).

231953491 is a wasteful number, since it uses less digits than its factorization.

231953491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 305 counting only the distinct ones).

The product of its digits is 29160, while the sum is 37.

The square root of 231953491 is about 15230.0194024827. The cubic root of 231953491 is about 614.4223019381.

The spelling of 231953491 in words is "two hundred thirty-one million, nine hundred fifty-three thousand, four hundred ninety-one".