990100001 has 8 divisors (see below), whose sum is σ = 1088615424. Its totient is φ = 893002320.

The previous prime is 990099977. The next prime is 990100003. The reversal of 990100001 is 100001099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990100003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352970 + ... + 355763.

It is an arithmetic number, because the mean of its divisors is an integer number (136076928).

Almost surely, 2^990100001 is an apocalyptic number.

It is an amenable number.

990100001 is a deficient number, since it is larger than the sum of its proper divisors (98515423).

990100001 is a wasteful number, since it uses less digits than its factorization.

990100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708871.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 990100001 is about 31465.8545251833. The cubic root of 990100001 is about 996.6890500424.

The spelling of 990100001 in words is "nine hundred ninety million, one hundred thousand, one".