1965713561 has 16 divisors (see below), whose sum is σ = 2383948800. Its totient is φ = 1584317328.

The previous prime is 1965713549. The next prime is 1965713579. The reversal of 1965713561 is 1653175691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965713561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1965713531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93971 + ... + 112968.

It is an arithmetic number, because the mean of its divisors is an integer number (148996800).

Almost surely, 2^1965713561 is an apocalyptic number.

It is an amenable number.

1965713561 is a deficient number, since it is larger than the sum of its proper divisors (418235239).

1965713561 is a wasteful number, since it uses less digits than its factorization.

1965713561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207028.

The product of its digits is 170100, while the sum is 44.

The square root of 1965713561 is about 44336.3683785670. The cubic root of 1965713561 is about 1252.6798104671.

The spelling of 1965713561 in words is "one billion, nine hundred sixty-five million, seven hundred thirteen thousand, five hundred sixty-one".