991040002 has 8 divisors (see below), whose sum is σ = 1486973196. Its totient is φ = 495382272.

The previous prime is 991039999. The next prime is 991040027. The reversal of 991040002 is 200040199.

It can be written as a sum of positive squares in 2 ways, for example, as 949810761 + 41229241 = 30819^2 + 6421^2 .

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

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, 59623 + ... + 74410.

Almost surely, 2^991040002 is an apocalyptic number.

991040002 is a deficient number, since it is larger than the sum of its proper divisors (495933194).

991040002 is a wasteful number, since it uses less digits than its factorization.

991040002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137732.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 991040002 is about 31480.7878236870. The cubic root of 991040002 is about 997.0043691566.

The spelling of 991040002 in words is "nine hundred ninety-one million, forty thousand, two".