961380831 has 4 divisors (see below), whose sum is σ = 1281841112. Its totient is φ = 640920552.

The previous prime is 961380809. The next prime is 961380899. The reversal of 961380831 is 138083169.

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

It is not a de Polignac number, because 961380831 - 2²³ = 952992223 is a prime.

It is a super-2 number, since 2×961380831² = 1848506204428501122, 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 961380831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961382831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160230136 + ... + 160230141.

It is an arithmetic number, because the mean of its divisors is an integer number (320460278).

Almost surely, 2^961380831 is an apocalyptic number.

961380831 is a deficient number, since it is larger than the sum of its proper divisors (320460281).

961380831 is a wasteful number, since it uses less digits than its factorization.

961380831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320460280.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 961380831 is about 31006.1418270639. The cubic root of 961380831 is about 986.9575784323.

The spelling of 961380831 in words is "nine hundred sixty-one million, three hundred eighty thousand, eight hundred thirty-one".