764131439 has 2 divisors, whose sum is σ = 764131440. Its totient is φ = 764131438.

The previous prime is 764131429. The next prime is 764131447. The reversal of 764131439 is 934131467.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-764131439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764131429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382065719 + 382065720.

It is an arithmetic number, because the mean of its divisors is an integer number (382065720).

Almost surely, 2^764131439 is an apocalyptic number.

764131439 is a deficient number, since it is larger than the sum of its proper divisors (1).

764131439 is an equidigital number, since it uses as much as digits as its factorization.

764131439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 764131439 is about 27642.9274679799. The cubic root of 764131439 is about 914.2311671989.

The spelling of 764131439 in words is "seven hundred sixty-four million, one hundred thirty-one thousand, four hundred thirty-nine".