1213131164 has 48 divisors (see below), whose sum is σ = 2456422080. Its totient is φ = 513492480.

The previous prime is 1213131163. The next prime is 1213131167. The reversal of 1213131164 is 4611313121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213131163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877754 + ... + 879134.

It is an arithmetic number, because the mean of its divisors is an integer number (51175460).

Almost surely, 2^1213131164 is an apocalyptic number.

1213131164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1213131164 is an abundant number, since it is smaller than the sum of its proper divisors (1243290916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213131164 is a wasteful number, since it uses less digits than its factorization.

1213131164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758 (or 1756 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 1213131164 is about 34830.0325007026. The cubic root of 1213131164 is about 1066.5206118164.

Adding to 1213131164 its reverse (4611313121), we get a palindrome (5824444285).

The spelling of 1213131164 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, one hundred sixty-four".