990211497 has 16 divisors (see below), whose sum is σ = 1457664768. Its totient is φ = 592896080.

The previous prime is 990211489. The next prime is 990211499. The reversal of 990211497 is 794112099.

It is a cyclic number.

It is not a de Polignac number, because 990211497 - 2³ = 990211489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990211499) 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, 178023 + ... + 183500.

It is an arithmetic number, because the mean of its divisors is an integer number (91104048).

Almost surely, 2^990211497 is an apocalyptic number.

It is an amenable number.

990211497 is a deficient number, since it is larger than the sum of its proper divisors (467453271).

990211497 is a wasteful number, since it uses less digits than its factorization.

990211497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361620.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 990211497 is about 31467.6261735772. The cubic root of 990211497 is about 996.7264613042.

The spelling of 990211497 in words is "nine hundred ninety million, two hundred eleven thousand, four hundred ninety-seven".