231492281 has 8 divisors (see below), whose sum is σ = 245243880. Its totient is φ = 217755648.

The previous prime is 231492269. The next prime is 231492299. The reversal of 231492281 is 182294132.

It can be written as a sum of positive squares in 4 ways, for example, as 104366656 + 127125625 = 10216^2 + 11275^2 .

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-231492281 is a prime.

It is a super-2 number, since 2×231492281² = 107177352325165922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231492251) 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, 51725 + ... + 56021.

It is an arithmetic number, because the mean of its divisors is an integer number (30655485).

Almost surely, 2^231492281 is an apocalyptic number.

It is an amenable number.

231492281 is a deficient number, since it is larger than the sum of its proper divisors (13751599).

231492281 is a wasteful number, since it uses less digits than its factorization.

231492281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7483.

The product of its digits is 6912, while the sum is 32.

The square root of 231492281 is about 15214.8703905094. The cubic root of 231492281 is about 614.0147982088.

The spelling of 231492281 in words is "two hundred thirty-one million, four hundred ninety-two thousand, two hundred eighty-one".