991749475 has 6 divisors (see below), whose sum is σ = 1229769380. Its totient is φ = 793399560.

The previous prime is 991749433. The next prime is 991749523. The reversal of 991749475 is 574947199.

It is not a de Polignac number, because 991749475 - 2¹⁵ = 991716707 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19834965 + ... + 19835014.

Almost surely, 2^991749475 is an apocalyptic number.

991749475 is a deficient number, since it is larger than the sum of its proper divisors (238019905).

991749475 is a wasteful number, since it uses less digits than its factorization.

991749475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39669989 (or 39669984 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 55.

The square root of 991749475 is about 31492.0541565646. The cubic root of 991749475 is about 997.2422266775.

The spelling of 991749475 in words is "nine hundred ninety-one million, seven hundred forty-nine thousand, four hundred seventy-five".