961968721 has 8 divisors (see below), whose sum is σ = 1147192704. Its totient is φ = 788694720.

The previous prime is 961968697. The next prime is 961968731. The reversal of 961968721 is 127869169.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 961968721 - 2²⁷ = 827750993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (961968731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2987320 + ... + 2987641.

It is an arithmetic number, because the mean of its divisors is an integer number (143399088).

Almost surely, 2^961968721 is an apocalyptic number.

It is an amenable number.

961968721 is a deficient number, since it is larger than the sum of its proper divisors (185223983).

961968721 is a wasteful number, since it uses less digits than its factorization.

961968721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5974991.

The product of its digits is 326592, while the sum is 49.

The square root of 961968721 is about 31015.6205967251. The cubic root of 961968721 is about 987.1587142162.

The spelling of 961968721 in words is "nine hundred sixty-one million, nine hundred sixty-eight thousand, seven hundred twenty-one".