990154556 has 12 divisors (see below), whose sum is σ = 1736632800. Its totient is φ = 493973760.

The previous prime is 990154547. The next prime is 990154573. The reversal of 990154556 is 655451099.

990154556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273860 + ... + 277451.

It is an arithmetic number, because the mean of its divisors is an integer number (144719400).

Almost surely, 2^990154556 is an apocalyptic number.

It is an amenable number.

990154556 is a deficient number, since it is larger than the sum of its proper divisors (746478244).

990154556 is a wasteful number, since it uses less digits than its factorization.

990154556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551764 (or 551762 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 990154556 is about 31466.7214053196. The cubic root of 990154556 is about 996.7073557261.

The spelling of 990154556 in words is "nine hundred ninety million, one hundred fifty-four thousand, five hundred fifty-six".