1591968145 has 16 divisors (see below), whose sum is σ = 2069781120. Its totient is φ = 1170779904.

The previous prime is 1591968139. The next prime is 1591968151. The reversal of 1591968145 is 5418691951.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1591968139) and next prime (1591968151).

It is a cyclic number.

It is not a de Polignac number, because 1591968145 - 2⁹ = 1591967633 is a prime.

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, 214125 + ... + 221434.

It is an arithmetic number, because the mean of its divisors is an integer number (129361320).

Almost surely, 2^1591968145 is an apocalyptic number.

It is an amenable number.

1591968145 is a deficient number, since it is larger than the sum of its proper divisors (477812975).

1591968145 is a wasteful number, since it uses less digits than its factorization.

1591968145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435624.

The product of its digits is 388800, while the sum is 49.

The square root of 1591968145 is about 39899.4754978057. The cubic root of 1591968145 is about 1167.6467040803.

The spelling of 1591968145 in words is "one billion, five hundred ninety-one million, nine hundred sixty-eight thousand, one hundred forty-five".