961631 has 4 divisors (see below), whose sum is σ = 1049064. Its totient is φ = 874200.

The previous prime is 961627. The next prime is 961633. The reversal of 961631 is 136169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136169 = 11 ⋅12379.

It is a cyclic number.

It is not a de Polignac number, because 961631 - 2² = 961627 is a prime.

It is a super-2 number, since 2×961631² = 1849468360322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 961631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43700 + ... + 43721.

It is an arithmetic number, because the mean of its divisors is an integer number (262266).

2⁹⁶¹⁶³¹ is an apocalyptic number.

961631 is a deficient number, since it is larger than the sum of its proper divisors (87433).

961631 is a wasteful number, since it uses less digits than its factorization.

961631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87432.

The product of its digits is 972, while the sum is 26.

The square root of 961631 is about 980.6278600978. The cubic root of 961631 is about 98.7043179188.

The spelling of 961631 in words is "nine hundred sixty-one thousand, six hundred thirty-one".