1591147964 has 24 divisors (see below), whose sum is σ = 3250007040. Its totient is φ = 667411056.

The previous prime is 1591147949. The next prime is 1591147969. The reversal of 1591147964 is 4697411951.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591147969) 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, 603224 + ... + 605855.

It is an arithmetic number, because the mean of its divisors is an integer number (135416960).

Almost surely, 2^1591147964 is an apocalyptic number.

1591147964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1591147964 is an abundant number, since it is smaller than the sum of its proper divisors (1658859076).

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

1591147964 is a wasteful number, since it uses less digits than its factorization.

1591147964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209137 (or 1209135 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 1591147964 is about 39889.1960811446. The cubic root of 1591147964 is about 1167.4461460149.

The spelling of 1591147964 in words is "one billion, five hundred ninety-one million, one hundred forty-seven thousand, nine hundred sixty-four".