1231313287 has 2 divisors, whose sum is σ = 1231313288. Its totient is φ = 1231313286.

The previous prime is 1231313263. The next prime is 1231313323. The reversal of 1231313287 is 7823131321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231313287 - 2¹¹ = 1231311239 is a prime.

It is a super-2 number, since 2×1231313287² = 3032264821485488738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231313687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615656643 + 615656644.

It is an arithmetic number, because the mean of its divisors is an integer number (615656644).

Almost surely, 2^1231313287 is an apocalyptic number.

1231313287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231313287 is an equidigital number, since it uses as much as digits as its factorization.

1231313287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 1231313287 is about 35090.0739098680. The cubic root of 1231313287 is about 1071.8224646477.

It can be divided in two parts, 12313 and 13287, that added together give a square (25600 = 160²).

The spelling of 1231313287 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, two hundred eighty-seven".