961908889 has 4 divisors (see below), whose sum is σ = 992938240. Its totient is φ = 930879540.

The previous prime is 961908881. The next prime is 961908901. The reversal of 961908889 is 988809169.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 961908889 - 2³ = 961908881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961908881) 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, 15514629 + ... + 15514690.

It is an arithmetic number, because the mean of its divisors is an integer number (248234560).

Almost surely, 2^961908889 is an apocalyptic number.

It is an amenable number.

961908889 is a deficient number, since it is larger than the sum of its proper divisors (31029351).

961908889 is a wasteful number, since it uses less digits than its factorization.

961908889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31029350.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 961908889 is about 31014.6560354939. The cubic root of 961908889 is about 987.1382475408.

The spelling of 961908889 in words is "nine hundred sixty-one million, nine hundred eight thousand, eight hundred eighty-nine".