990474691 has 4 divisors (see below), whose sum is σ = 1033538832. Its totient is φ = 947410552.

The previous prime is 990474643. The next prime is 990474733. The reversal of 990474691 is 196474099.

990474691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 990474691 - 2²⁷ = 856256963 is a prime.

It is a super-2 number, since 2×990474691² = 1962080227023090962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990474631) 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, 21532036 + ... + 21532081.

It is an arithmetic number, because the mean of its divisors is an integer number (258384708).

Almost surely, 2^990474691 is an apocalyptic number.

990474691 is a deficient number, since it is larger than the sum of its proper divisors (43064141).

990474691 is a wasteful number, since it uses less digits than its factorization.

990474691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43064140.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 990474691 is about 31471.8078762565. The cubic root of 990474691 is about 996.8147620313.

The spelling of 990474691 in words is "nine hundred ninety million, four hundred seventy-four thousand, six hundred ninety-one".