961338891 has 4 divisors (see below), whose sum is σ = 1281785192. Its totient is φ = 640892592.

The previous prime is 961338881. The next prime is 961338901. The reversal of 961338891 is 198833169.

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

It is an interprime number because it is at equal distance from previous prime (961338881) and next prime (961338901).

It is not a de Polignac number, because 961338891 - 2¹⁸ = 961076747 is a prime.

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 961338891.

It is not an unprimeable number, because it can be changed into a prime (961338841) 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, 160223146 + ... + 160223151.

It is an arithmetic number, because the mean of its divisors is an integer number (320446298).

Almost surely, 2^961338891 is an apocalyptic number.

961338891 is a deficient number, since it is larger than the sum of its proper divisors (320446301).

961338891 is a wasteful number, since it uses less digits than its factorization.

961338891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320446300.

The product of its digits is 279936, while the sum is 48.

The square root of 961338891 is about 31005.4655020691. The cubic root of 961338891 is about 986.9432262972.

The spelling of 961338891 in words is "nine hundred sixty-one million, three hundred thirty-eight thousand, eight hundred ninety-one".