231985153 has 8 divisors (see below), whose sum is σ = 248614848. Its totient is φ = 215900784.

The previous prime is 231985141. The next prime is 231985157. The reversal of 231985153 is 351589132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231985153 is a prime.

It is a super-2 number, since 2×231985153² = 107634222424866818, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231985157) 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, 135451 + ... + 137152.

It is an arithmetic number, because the mean of its divisors is an integer number (31076856).

Almost surely, 2^231985153 is an apocalyptic number.

231985153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

231985153 is a deficient number, since it is larger than the sum of its proper divisors (16629695).

231985153 is a wasteful number, since it uses less digits than its factorization.

231985153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272663.

The product of its digits is 32400, while the sum is 37.

The square root of 231985153 is about 15231.0588272779. The cubic root of 231985153 is about 614.4502571886.

The spelling of 231985153 in words is "two hundred thirty-one million, nine hundred eighty-five thousand, one hundred fifty-three".