991294963 has 4 divisors (see below), whose sum is σ = 1034394768. Its totient is φ = 948195160.

The previous prime is 991294919. The next prime is 991294981. The reversal of 991294963 is 369492199.

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 991294963 - 2¹⁷ = 991163891 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 991294963.

It is not an unprimeable number, because it can be changed into a prime (991294903) 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, 21549868 + ... + 21549913.

It is an arithmetic number, because the mean of its divisors is an integer number (258598692).

Almost surely, 2^991294963 is an apocalyptic number.

991294963 is a deficient number, since it is larger than the sum of its proper divisors (43099805).

991294963 is a wasteful number, since it uses less digits than its factorization.

991294963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43099804.

The product of its digits is 944784, while the sum is 52.

The square root of 991294963 is about 31484.8370330863. The cubic root of 991294963 is about 997.0898603022.

The spelling of 991294963 in words is "nine hundred ninety-one million, two hundred ninety-four thousand, nine hundred sixty-three".