961891018 has 16 divisors (see below), whose sum is σ = 1576459584. Its totient is φ = 436540960.

The previous prime is 961891013. The next prime is 961891019. The reversal of 961891018 is 810198169.

It is a happy number.

961891018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (961891013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19555 + ... + 48022.

It is an arithmetic number, because the mean of its divisors is an integer number (98528724).

Almost surely, 2^961891018 is an apocalyptic number.

961891018 is a deficient number, since it is larger than the sum of its proper divisors (614568566).

961891018 is a wasteful number, since it uses less digits than its factorization.

961891018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68237.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 961891018 is about 31014.3679284296. The cubic root of 961891018 is about 987.1321342601.

The spelling of 961891018 in words is "nine hundred sixty-one million, eight hundred ninety-one thousand, eighteen".