990557601 has 32 divisors (see below), whose sum is σ = 1502171136. Its totient is φ = 575160000.

The previous prime is 990557597. The next prime is 990557641. The reversal of 990557601 is 106755099.

990557601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990557601 - 2² = 990557597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990557641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98530 + ... + 108116.

It is an arithmetic number, because the mean of its divisors is an integer number (46942848).

Almost surely, 2^990557601 is an apocalyptic number.

It is an amenable number.

990557601 is a deficient number, since it is larger than the sum of its proper divisors (511613535).

990557601 is a wasteful number, since it uses less digits than its factorization.

990557601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9733.

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 990557601 is about 31473.1250593264. The cubic root of 990557601 is about 996.8425748254.

The spelling of 990557601 in words is "nine hundred ninety million, five hundred fifty-seven thousand, six hundred one".