1991459604 has 48 divisors (see below), whose sum is σ = 4714573248. Its totient is φ = 654194688.

The previous prime is 1991459579. The next prime is 1991459633. The reversal of 1991459604 is 4069541991.

It is a happy number.

It is a super-2 number, since 2×1991459604² = 7931822708727673632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249012 + ... + 256884.

It is an arithmetic number, because the mean of its divisors is an integer number (98220276).

Almost surely, 2^1991459604 is an apocalyptic number.

It is an amenable number.

1991459604 is an abundant number, since it is smaller than the sum of its proper divisors (2723113644).

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

1991459604 is a wasteful number, since it uses less digits than its factorization.

1991459604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184 (or 8182 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 1991459604 is about 44625.7728672569. The cubic root of 1991459604 is about 1258.1251203565.

The spelling of 1991459604 in words is "one billion, nine hundred ninety-one million, four hundred fifty-nine thousand, six hundred four".