1991149074 has 32 divisors (see below), whose sum is σ = 4427280000. Its totient is φ = 663340752.

The previous prime is 1991149049. The next prime is 1991149079. The reversal of 1991149074 is 4709411991.

1991149074 is a `hidden beast` number, since 1 + 9 + 91 + 1 + 490 + 74 = 666.

It is not an unprimeable number, because it can be changed into a prime (1991149079) 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, 95787 + ... + 114705.

It is an arithmetic number, because the mean of its divisors is an integer number (138352500).

Almost surely, 2^1991149074 is an apocalyptic number.

1991149074 is an abundant number, since it is smaller than the sum of its proper divisors (2436130926).

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

1991149074 is a wasteful number, since it uses less digits than its factorization.

1991149074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20879 (or 20873 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 1991149074 is about 44622.2934641419. The cubic root of 1991149074 is about 1258.0597234484.

The spelling of 1991149074 in words is "one billion, nine hundred ninety-one million, one hundred forty-nine thousand, seventy-four".