231213005 has 12 divisors (see below), whose sum is σ = 294738420. Its totient is φ = 174088704.

The previous prime is 231212987. The next prime is 231213007. The reversal of 231213005 is 500312132.

231213005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 75811849 + 155401156 = 8707^2 + 12466^2 .

It is not a de Polignac number, because 231213005 - 2²⁴ = 214435789 is a prime.

It is a super-2 number, since 2×231213005² = 106918907362260050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78560 + ... + 81449.

It is an arithmetic number, because the mean of its divisors is an integer number (24561535).

Almost surely, 2^231213005 is an apocalyptic number.

It is an amenable number.

231213005 is a deficient number, since it is larger than the sum of its proper divisors (63525415).

231213005 is a wasteful number, since it uses less digits than its factorization.

231213005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160048 (or 160031 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 231213005 is about 15205.6898889856. The cubic root of 231213005 is about 613.7677797469.

Adding to 231213005 its reverse (500312132), we get a palindrome (731525137).

The spelling of 231213005 in words is "two hundred thirty-one million, two hundred thirteen thousand, five".