961816631 has 4 divisors (see below), whose sum is σ = 962010072. Its totient is φ = 961623192.

The previous prime is 961816619. The next prime is 961816649. The reversal of 961816631 is 136618169.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 961816631 - 2¹⁰ = 961815607 is a prime.

It is a super-2 number, since 2×961816631² = 1850182463336380322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961816831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89060 + ... + 99273.

It is an arithmetic number, because the mean of its divisors is an integer number (240502518).

Almost surely, 2^961816631 is an apocalyptic number.

961816631 is a deficient number, since it is larger than the sum of its proper divisors (193441).

961816631 is a wasteful number, since it uses less digits than its factorization.

961816631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193440.

The product of its digits is 46656, while the sum is 41.

The square root of 961816631 is about 31013.1686707437. The cubic root of 961816631 is about 987.1066872710.

The spelling of 961816631 in words is "nine hundred sixty-one million, eight hundred sixteen thousand, six hundred thirty-one".