1231307887 has 2 divisors, whose sum is σ = 1231307888. Its totient is φ = 1231307886.

The previous prime is 1231307873. The next prime is 1231307899. The reversal of 1231307887 is 7887031321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231307887 is a prime.

It is a super-2 number, since 2×1231307887² = 3032238225176809538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231307837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615653943 + 615653944.

It is an arithmetic number, because the mean of its divisors is an integer number (615653944).

Almost surely, 2^1231307887 is an apocalyptic number.

1231307887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231307887 is an equidigital number, since it uses as much as digits as its factorization.

1231307887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1231307887 is about 35089.9969649471. The cubic root of 1231307887 is about 1071.8208977977.

The spelling of 1231307887 in words is "one billion, two hundred thirty-one million, three hundred seven thousand, eight hundred eighty-seven".