231022013 has 4 divisors (see below), whose sum is σ = 238474368. Its totient is φ = 223569660.

The previous prime is 231022009. The next prime is 231022039. The reversal of 231022013 is 310220132.

It is a happy number.

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 231022013 - 2² = 231022009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231022513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3726131 + ... + 3726192.

It is an arithmetic number, because the mean of its divisors is an integer number (59618592).

Almost surely, 2^231022013 is an apocalyptic number.

It is an amenable number.

231022013 is a deficient number, since it is larger than the sum of its proper divisors (7452355).

231022013 is an equidigital number, since it uses as much as digits as its factorization.

231022013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7452354.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231022013 is about 15199.4083108521. The cubic root of 231022013 is about 613.5987335634.

Adding to 231022013 its reverse (310220132), we get a palindrome (541242145).

It can be divided in two parts, 2 and 31022013, that multiplied together give a palindrome (62044026).

The spelling of 231022013 in words is "two hundred thirty-one million, twenty-two thousand, thirteen".