991445490 has 48 divisors (see below), whose sum is σ = 2946011328. Its totient is φ = 226615968.

The previous prime is 991445473. The next prime is 991445519. The reversal of 991445490 is 94544199.

991445490 is a `hidden beast` number, since 99 + 14 + 4 + 549 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 786232 + ... + 787491.

It is an arithmetic number, because the mean of its divisors is an integer number (61375236).

Almost surely, 2^991445490 is an apocalyptic number.

991445490 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

991445490 is an abundant number, since it is smaller than the sum of its proper divisors (1954565838).

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

991445490 is a wasteful number, since it uses less digits than its factorization.

991445490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573743 (or 1573740 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 991445490 is about 31487.2274104914. The cubic root of 991445490 is about 997.1403267307.

The spelling of 991445490 in words is "nine hundred ninety-one million, four hundred forty-five thousand, four hundred ninety".