961765613 has 4 divisors (see below), whose sum is σ = 979912188. Its totient is φ = 943619040.

The previous prime is 961765591. The next prime is 961765661. The reversal of 961765613 is 316567169.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 832784164 + 128981449 = 28858^2 + 11357^2 .

It is a cyclic number.

It is not a de Polignac number, because 961765613 - 2¹⁸ = 961503469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961765813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9073208 + ... + 9073313.

It is an arithmetic number, because the mean of its divisors is an integer number (244978047).

Almost surely, 2^961765613 is an apocalyptic number.

It is an amenable number.

961765613 is a deficient number, since it is larger than the sum of its proper divisors (18146575).

961765613 is a wasteful number, since it uses less digits than its factorization.

961765613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18146574.

The product of its digits is 204120, while the sum is 44.

The square root of 961765613 is about 31012.3461382721. The cubic root of 961765613 is about 987.0892338057.

The spelling of 961765613 in words is "nine hundred sixty-one million, seven hundred sixty-five thousand, six hundred thirteen".