991119877 has 8 divisors (see below), whose sum is σ = 1085072832. Its totient is φ = 897808800.

The previous prime is 991119853. The next prime is 991119917. The reversal of 991119877 is 778911199.

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

It is a cyclic number.

It is not a de Polignac number, because 991119877 - 2¹⁵ = 991087109 is a prime.

It is a super-2 number, since 2×991119877² = 1964637221168990258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991119977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157233 + ... + 163414.

It is an arithmetic number, because the mean of its divisors is an integer number (135634104).

Almost surely, 2^991119877 is an apocalyptic number.

It is an amenable number.

991119877 is a deficient number, since it is larger than the sum of its proper divisors (93952955).

991119877 is a wasteful number, since it uses less digits than its factorization.

991119877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320939.

The product of its digits is 285768, while the sum is 52.

The square root of 991119877 is about 31482.0564290200. The cubic root of 991119877 is about 997.0311536740.

The spelling of 991119877 in words is "nine hundred ninety-one million, one hundred nineteen thousand, eight hundred seventy-seven".