990122869 has 4 divisors (see below), whose sum is σ = 990215244. Its totient is φ = 990030496.

The previous prime is 990122831. The next prime is 990122873. The reversal of 990122869 is 968221099.

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 can be written as a sum of positive squares in 2 ways, for example, as 104346225 + 885776644 = 10215^2 + 29762^2 .

It is a cyclic number.

It is not a de Polignac number, because 990122869 - 2⁷ = 990122741 is a prime.

It is a super-2 number, since 2×990122869² = 1960686591433582322, 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 (990120869) 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, 27622 + ... + 52375.

It is an arithmetic number, because the mean of its divisors is an integer number (247553811).

Almost surely, 2^990122869 is an apocalyptic number.

It is an amenable number.

990122869 is a deficient number, since it is larger than the sum of its proper divisors (92375).

990122869 is a wasteful number, since it uses less digits than its factorization.

990122869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92374.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 990122869 is about 31466.2179011078. The cubic root of 990122869 is about 996.6967233783.

The spelling of 990122869 in words is "nine hundred ninety million, one hundred twenty-two thousand, eight hundred sixty-nine".