991634474 has 16 divisors (see below), whose sum is σ = 1494831240. Its totient is φ = 493363200.

The previous prime is 991634459. The next prime is 991634503. The reversal of 991634474 is 474436199.

It can be written as a sum of positive squares in 4 ways, for example, as 456036025 + 535598449 = 21355^2 + 23143^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703082 + ... + 704490.

Almost surely, 2^991634474 is an apocalyptic number.

991634474 is a deficient number, since it is larger than the sum of its proper divisors (503196766).

991634474 is a wasteful number, since it uses less digits than its factorization.

991634474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905.

The product of its digits is 653184, while the sum is 47.

The square root of 991634474 is about 31490.2282303574. The cubic root of 991634474 is about 997.2036792119.

The spelling of 991634474 in words is "nine hundred ninety-one million, six hundred thirty-four thousand, four hundred seventy-four".