991845498 has 32 divisors (see below), whose sum is σ = 2309855616. Its totient is φ = 278036928.

The previous prime is 991845493. The next prime is 991845499. The reversal of 991845498 is 894548199.

It is not an unprimeable number, because it can be changed into a prime (991845493) 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, 220561 + ... + 225012.

It is an arithmetic number, because the mean of its divisors is an integer number (72182988).

Almost surely, 2^991845498 is an apocalyptic number.

991845498 is an abundant number, since it is smaller than the sum of its proper divisors (1318010118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991845498 is a wasteful number, since it uses less digits than its factorization.

991845498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445638.

The product of its digits is 3732480, while the sum is 57.

The square root of 991845498 is about 31493.5786788355. The cubic root of 991845498 is about 997.2744105783.

The spelling of 991845498 in words is "nine hundred ninety-one million, eight hundred forty-five thousand, four hundred ninety-eight".