991162458 has 96 divisors (see below), whose sum is σ = 2671486272. Its totient is φ = 260928000.

The previous prime is 991162457. The next prime is 991162463. The reversal of 991162458 is 854261199.

991162458 is a `hidden beast` number, since 9 + 9 + 11 + 624 + 5 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (991162457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32433 + ... + 55083.

It is an arithmetic number, because the mean of its divisors is an integer number (27827982).

Almost surely, 2^991162458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991162458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335743136).

991162458 is an abundant number, since it is smaller than the sum of its proper divisors (1680323814).

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

991162458 is a wasteful number, since it uses less digits than its factorization.

991162458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22700 (or 22697 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 991162458 is about 31482.7326958763. The cubic root of 991162458 is about 997.0454317906.

The spelling of 991162458 in words is "nine hundred ninety-one million, one hundred sixty-two thousand, four hundred fifty-eight".