961511321 has 4 divisors (see below), whose sum is σ = 1012117200. Its totient is φ = 910905444.

The previous prime is 961511293. The next prime is 961511329. The reversal of 961511321 is 123115169.

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 a de Polignac number, because none of the positive numbers 2^k-961511321 is a prime.

It is a super-2 number, since 2×961511321² = 1849008040822330082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961511329) 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, 25302911 + ... + 25302948.

It is an arithmetic number, because the mean of its divisors is an integer number (253029300).

Almost surely, 2^961511321 is an apocalyptic number.

It is an amenable number.

961511321 is a deficient number, since it is larger than the sum of its proper divisors (50605879).

961511321 is a wasteful number, since it uses less digits than its factorization.

961511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50605878.

The product of its digits is 1620, while the sum is 29.

The square root of 961511321 is about 31008.2460161809. The cubic root of 961511321 is about 987.0022302719.

The spelling of 961511321 in words is "nine hundred sixty-one million, five hundred eleven thousand, three hundred twenty-one".