961440631 has 2 divisors, whose sum is σ = 961440632. Its totient is φ = 961440630.

The previous prime is 961440629. The next prime is 961440637. The reversal of 961440631 is 136044169.

It is a weak prime.

It is an emirp because it is prime and its reverse (136044169) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 961440631 - 2¹ = 961440629 is a prime.

It is a super-2 number, since 2×961440631² = 1848736173875356322, which contains 22 as substring.

Together with 961440629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961440637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480720315 + 480720316.

It is an arithmetic number, because the mean of its divisors is an integer number (480720316).

Almost surely, 2^961440631 is an apocalyptic number.

961440631 is a deficient number, since it is larger than the sum of its proper divisors (1).

961440631 is an equidigital number, since it uses as much as digits as its factorization.

961440631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 961440631 is about 31007.1061371422. The cubic root of 961440631 is about 986.9780416513.

The spelling of 961440631 in words is "nine hundred sixty-one million, four hundred forty thousand, six hundred thirty-one".