1591791216 has 40 divisors (see below), whose sum is σ = 4212428304. Its totient is φ = 517655040.

The previous prime is 1591791169. The next prime is 1591791217. The reversal of 1591791216 is 6121971951.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591791217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402451 + ... + 406386.

Almost surely, 2^1591791216 is an apocalyptic number.

1591791216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1591791216 is an abundant number, since it is smaller than the sum of its proper divisors (2620637088).

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

1591791216 is a wasteful number, since it uses less digits than its factorization.

1591791216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808889 (or 808883 counting only the distinct ones).

The product of its digits is 34020, while the sum is 42.

The square root of 1591791216 is about 39897.2582516644. The cubic root of 1591791216 is about 1167.6034456315.

The spelling of 1591791216 in words is "one billion, five hundred ninety-one million, seven hundred ninety-one thousand, two hundred sixteen".