1231316188 has 24 divisors (see below), whose sum is σ = 2282742000. Its totient is φ = 579141888.

The previous prime is 1231316173. The next prime is 1231316189. The reversal of 1231316188 is 8816131321.

It is a happy number.

It is a super-2 number, since 2×1231316188² = 3032279109661702688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231316189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180178 + ... + 186886.

It is an arithmetic number, because the mean of its divisors is an integer number (95114250).

Almost surely, 2^1231316188 is an apocalyptic number.

It is an amenable number.

1231316188 is a deficient number, since it is larger than the sum of its proper divisors (1051425812).

1231316188 is a wasteful number, since it uses less digits than its factorization.

1231316188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429 (or 9427 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 1231316188 is about 35090.1152463197. The cubic root of 1231316188 is about 1071.8233063925.

The spelling of 1231316188 in words is "one billion, two hundred thirty-one million, three hundred sixteen thousand, one hundred eighty-eight".