1913697565 has 16 divisors (see below), whose sum is σ = 2618563248. Its totient is φ = 1330062336.

The previous prime is 1913697529. The next prime is 1913697571. The reversal of 1913697565 is 5657963191.

It can be written as a sum of positive squares in 8 ways, for example, as 1734489 + 1911963076 = 1317^2 + 43726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913697565 - 2⁷ = 1913697437 is a prime.

It is a Duffinian number.

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, 864822 + ... + 867031.

It is an arithmetic number, because the mean of its divisors is an integer number (163660203).

Almost surely, 2^1913697565 is an apocalyptic number.

It is an amenable number.

1913697565 is a deficient number, since it is larger than the sum of its proper divisors (704865683).

1913697565 is a wasteful number, since it uses less digits than its factorization.

1913697565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731888.

The product of its digits is 1530900, while the sum is 52.

The square root of 1913697565 is about 43745.8291154711. The cubic root of 1913697565 is about 1241.5315720074.

The spelling of 1913697565 in words is "one billion, nine hundred thirteen million, six hundred ninety-seven thousand, five hundred sixty-five".