961943917 has 4 divisors (see below), whose sum is σ = 1049393376. Its totient is φ = 874494460.

The previous prime is 961943909. The next prime is 961943923. The reversal of 961943917 is 719349169.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 961943917 - 2³ = 961943909 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961943947) 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, 43724713 + ... + 43724734.

It is an arithmetic number, because the mean of its divisors is an integer number (262348344).

Almost surely, 2^961943917 is an apocalyptic number.

It is an amenable number.

961943917 is a deficient number, since it is larger than the sum of its proper divisors (87449459).

961943917 is a wasteful number, since it uses less digits than its factorization.

961943917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87449458.

The product of its digits is 367416, while the sum is 49.

The square root of 961943917 is about 31015.2207311185. The cubic root of 961943917 is about 987.1502296384.

The spelling of 961943917 in words is "nine hundred sixty-one million, nine hundred forty-three thousand, nine hundred seventeen".