961931 has 4 divisors (see below), whose sum is σ = 964752. Its totient is φ = 959112.

The previous prime is 961927. The next prime is 961937. The reversal of 961931 is 139169.

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 961931 - 2² = 961927 is a prime.

It is a super-2 number, since 2×961931² = 1850622497522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 961894 and 961903.

It is not an unprimeable number, because it can be changed into a prime (961937) 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, 815 + ... + 1608.

It is an arithmetic number, because the mean of its divisors is an integer number (241188).

2⁹⁶¹⁹³¹ is an apocalyptic number.

961931 is a deficient number, since it is larger than the sum of its proper divisors (2821).

961931 is a wasteful number, since it uses less digits than its factorization.

961931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

The product of its digits is 1458, while the sum is 29.

The square root of 961931 is about 980.7808113947. The cubic root of 961931 is about 98.7145811128.

The spelling of 961931 in words is "nine hundred sixty-one thousand, nine hundred thirty-one".