991303863 has 32 divisors (see below), whose sum is σ = 1501403904. Its totient is φ = 576480000.

The previous prime is 991303801. The next prime is 991303867. The reversal of 991303863 is 368303199.

It is not a de Polignac number, because 991303863 - 2⁹ = 991303351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991303867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76528 + ... + 88538.

It is an arithmetic number, because the mean of its divisors is an integer number (46918872).

Almost surely, 2^991303863 is an apocalyptic number.

991303863 is a deficient number, since it is larger than the sum of its proper divisors (510100041).

991303863 is a wasteful number, since it uses less digits than its factorization.

991303863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 991303863 is about 31484.9783706453. The cubic root of 991303863 is about 997.0928443024.

The spelling of 991303863 in words is "nine hundred ninety-one million, three hundred three thousand, eight hundred sixty-three".