756640631 has 2 divisors, whose sum is σ = 756640632. Its totient is φ = 756640630.

The previous prime is 756640589. The next prime is 756640657. The reversal of 756640631 is 136046657.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (136046657) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 756640631 - 2²⁶ = 689531767 is a prime.

It is a super-2 number, since 2×756640631² = 1145010088960156322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (756600631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378320315 + 378320316.

It is an arithmetic number, because the mean of its divisors is an integer number (378320316).

Almost surely, 2^756640631 is an apocalyptic number.

756640631 is a deficient number, since it is larger than the sum of its proper divisors (1).

756640631 is an equidigital number, since it uses as much as digits as its factorization.

756640631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 756640631 is about 27507.1014648945. The cubic root of 756640631 is about 911.2339380970.

The spelling of 756640631 in words is "seven hundred fifty-six million, six hundred forty thousand, six hundred thirty-one".