231956213 has 4 divisors (see below), whose sum is σ = 232054368. Its totient is φ = 231858060.

The previous prime is 231956203. The next prime is 231956243. The reversal of 231956213 is 312659132.

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 231956213 - 2¹⁸ = 231694069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231956213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231956203) 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 3 ways as a sum of consecutive naturals, for example, 45443 + ... + 50288.

It is an arithmetic number, because the mean of its divisors is an integer number (58013592).

Almost surely, 2^231956213 is an apocalyptic number.

It is an amenable number.

231956213 is a deficient number, since it is larger than the sum of its proper divisors (98155).

231956213 is an equidigital number, since it uses as much as digits as its factorization.

231956213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98154.

The product of its digits is 9720, while the sum is 32.

The square root of 231956213 is about 15230.1087652058. The cubic root of 231956213 is about 614.4247053667.

The spelling of 231956213 in words is "two hundred thirty-one million, nine hundred fifty-six thousand, two hundred thirteen".