991303899 has 8 divisors (see below), whose sum is σ = 1344141120. Its totient is φ = 649667976.

The previous prime is 991303883. The next prime is 991303903. The reversal of 991303899 is 998303199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991303899 - 2⁴ = 991303883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991302899) 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, 2800117 + ... + 2800470.

It is an arithmetic number, because the mean of its divisors is an integer number (168017640).

Almost surely, 2^991303899 is an apocalyptic number.

991303899 is a deficient number, since it is larger than the sum of its proper divisors (352837221).

991303899 is a wasteful number, since it uses less digits than its factorization.

991303899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600649.

The product of its (nonzero) digits is 472392, while the sum is 51.

The square root of 991303899 is about 31484.9789423465. The cubic root of 991303899 is about 997.0928563725.

The spelling of 991303899 in words is "nine hundred ninety-one million, three hundred three thousand, eight hundred ninety-nine".