961787161 has 4 divisors (see below), whose sum is σ = 962082000. Its totient is φ = 961492324.

The previous prime is 961787153. The next prime is 961787171. The reversal of 961787161 is 161787169.

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 961787161 - 2³ = 961787153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961787171) 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, 142471 + ... + 149068.

It is an arithmetic number, because the mean of its divisors is an integer number (240520500).

Almost surely, 2^961787161 is an apocalyptic number.

It is an amenable number.

961787161 is a deficient number, since it is larger than the sum of its proper divisors (294839).

961787161 is a wasteful number, since it uses less digits than its factorization.

961787161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294838.

The product of its digits is 127008, while the sum is 46.

The square root of 961787161 is about 31012.6935463529. The cubic root of 961787161 is about 987.0966055394.

The spelling of 961787161 in words is "nine hundred sixty-one million, seven hundred eighty-seven thousand, one hundred sixty-one".