991844475 has 12 divisors (see below), whose sum is σ = 1639849656. Its totient is φ = 528983680.

The previous prime is 991844467. The next prime is 991844507. The reversal of 991844475 is 574448199.

It is not a de Polignac number, because 991844475 - 2³ = 991844467 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6612222 + ... + 6612371.

It is an arithmetic number, because the mean of its divisors is an integer number (136654138).

Almost surely, 2^991844475 is an apocalyptic number.

991844475 is a deficient number, since it is larger than the sum of its proper divisors (648005181).

991844475 is a wasteful number, since it uses less digits than its factorization.

991844475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13224606 (or 13224601 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 991844475 is about 31493.5624374252. The cubic root of 991844475 is about 997.2740677117.

The spelling of 991844475 in words is "nine hundred ninety-one million, eight hundred forty-four thousand, four hundred seventy-five".