1231312258 has 16 divisors (see below), whose sum is σ = 2018183616. Its totient is φ = 558768240.

The previous prime is 1231312217. The next prime is 1231312259. The reversal of 1231312258 is 8522131321.

It is a super-2 number, since 2×1231312258² = 3032259753402117128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231312259) 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, 32166 + ... + 59137.

It is an arithmetic number, because the mean of its divisors is an integer number (126136476).

Almost surely, 2^1231312258 is an apocalyptic number.

1231312258 is a deficient number, since it is larger than the sum of its proper divisors (786871358).

1231312258 is a wasteful number, since it uses less digits than its factorization.

1231312258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91929.

The product of its digits is 2880, while the sum is 28.

The square root of 1231312258 is about 35090.0592475989. The cubic root of 1231312258 is about 1071.8221660761.

Adding to 1231312258 its reverse (8522131321), we get a palindrome (9753443579).

The spelling of 1231312258 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred fifty-eight".