990501897 has 16 divisors (see below), whose sum is σ = 1646548992. Its totient is φ = 514546320.

The previous prime is 990501881. The next prime is 990501929. The reversal of 990501897 is 798105099.

It is not a de Polignac number, because 990501897 - 2⁴ = 990501881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990501817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2143713 + ... + 2144174.

It is an arithmetic number, because the mean of its divisors is an integer number (102909312).

Almost surely, 2^990501897 is an apocalyptic number.

It is an amenable number.

990501897 is a deficient number, since it is larger than the sum of its proper divisors (656047095).

990501897 is a wasteful number, since it uses less digits than its factorization.

990501897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287908.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 990501897 is about 31472.2401013973. The cubic root of 990501897 is about 996.8238886633.

The spelling of 990501897 in words is "nine hundred ninety million, five hundred one thousand, eight hundred ninety-seven".