231953391 has 12 divisors (see below), whose sum is σ = 336917880. Its totient is φ = 153770640.

The previous prime is 231953369. The next prime is 231953411. The reversal of 231953391 is 193359132.

231953391 is a `hidden beast` number, since 2 + 31 + 9 + 533 + 91 = 666.

It is not a de Polignac number, because 231953391 - 2¹⁰ = 231952367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231953341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70380 + ... + 73601.

It is an arithmetic number, because the mean of its divisors is an integer number (28076490).

Almost surely, 2^231953391 is an apocalyptic number.

231953391 is a deficient number, since it is larger than the sum of its proper divisors (104964489).

231953391 is a wasteful number, since it uses less digits than its factorization.

231953391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144166 (or 144163 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 231953391 is about 15230.0161194925. The cubic root of 231953391 is about 614.4222136413.

The spelling of 231953391 in words is "two hundred thirty-one million, nine hundred fifty-three thousand, three hundred ninety-one".