961567631 has 2 divisors, whose sum is σ = 961567632. Its totient is φ = 961567630.

The previous prime is 961567609. The next prime is 961567639. The reversal of 961567631 is 136765169.

It is a strong prime.

It is an emirp because it is prime and its reverse (136765169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961567631 - 2²⁶ = 894458767 is a prime.

It is a super-2 number, since 2×961567631² = 1849224617973904322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961567639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480783815 + 480783816.

It is an arithmetic number, because the mean of its divisors is an integer number (480783816).

Almost surely, 2^961567631 is an apocalyptic number.

961567631 is a deficient number, since it is larger than the sum of its proper divisors (1).

961567631 is an equidigital number, since it uses as much as digits as its factorization.

961567631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 961567631 is about 31009.1539871697. The cubic root of 961567631 is about 987.0214975128.

The spelling of 961567631 in words is "nine hundred sixty-one million, five hundred sixty-seven thousand, six hundred thirty-one".