231272213 has 4 divisors (see below), whose sum is σ = 232125888. Its totient is φ = 230418540.

The previous prime is 231272203. The next prime is 231272219. The reversal of 231272213 is 312272132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231272213 - 2¹⁸ = 231010069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231272219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426431 + ... + 426972.

It is an arithmetic number, because the mean of its divisors is an integer number (58031472).

Almost surely, 2^231272213 is an apocalyptic number.

It is an amenable number.

231272213 is a deficient number, since it is larger than the sum of its proper divisors (853675).

231272213 is an equidigital number, since it uses as much as digits as its factorization.

231272213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853674.

The product of its digits is 1008, while the sum is 23.

The square root of 231272213 is about 15207.6366671485. The cubic root of 231272213 is about 613.8201655851.

The spelling of 231272213 in words is "two hundred thirty-one million, two hundred seventy-two thousand, two hundred thirteen".