787668131 has 2 divisors, whose sum is σ = 787668132. Its totient is φ = 787668130.

The previous prime is 787668127. The next prime is 787668137. The reversal of 787668131 is 131866787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 787668131 - 2² = 787668127 is a prime.

It is a super-2 number, since 2×787668131² = 1240842169186066322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (787668137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393834065 + 393834066.

It is an arithmetic number, because the mean of its divisors is an integer number (393834066).

Almost surely, 2^787668131 is an apocalyptic number.

787668131 is a deficient number, since it is larger than the sum of its proper divisors (1).

787668131 is an equidigital number, since it uses as much as digits as its factorization.

787668131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 787668131 is about 28065.4259009194. The cubic root of 787668131 is about 923.5230898329.

The spelling of 787668131 in words is "seven hundred eighty-seven million, six hundred sixty-eight thousand, one hundred thirty-one".