961766831 has 4 divisors (see below), whose sum is σ = 965791200. Its totient is φ = 957742464.

The previous prime is 961766797. The next prime is 961766851. The reversal of 961766831 is 138667169.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138667169 = 59 ⋅2350291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961766831 is a prime.

It is a super-2 number, since 2×961766831² = 1849990874423565122, 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 (961766851) 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, 2011826 + ... + 2012303.

It is an arithmetic number, because the mean of its divisors is an integer number (241447800).

Almost surely, 2^961766831 is an apocalyptic number.

961766831 is a deficient number, since it is larger than the sum of its proper divisors (4024369).

961766831 is a wasteful number, since it uses less digits than its factorization.

961766831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024368.

The product of its digits is 326592, while the sum is 47.

The square root of 961766831 is about 31012.3657756063. The cubic root of 961766831 is about 987.0896504957.

The spelling of 961766831 in words is "nine hundred sixty-one million, seven hundred sixty-six thousand, eight hundred thirty-one".