990031111 has 4 divisors (see below), whose sum is σ = 990101824. Its totient is φ = 989960400.

The previous prime is 990031109. The next prime is 990031117. The reversal of 990031111 is 111130099.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 990031111 - 2¹ = 990031109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990031117) 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, 6510 + ... + 44971.

It is an arithmetic number, because the mean of its divisors is an integer number (247525456).

Almost surely, 2^990031111 is an apocalyptic number.

990031111 is a deficient number, since it is larger than the sum of its proper divisors (70713).

990031111 is a wasteful number, since it uses less digits than its factorization.

990031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70712.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 990031111 is about 31464.7598274641. The cubic root of 990031111 is about 996.6659333534.

The spelling of 990031111 in words is "nine hundred ninety million, thirty-one thousand, one hundred eleven".