961765721 has 8 divisors (see below), whose sum is σ = 1103218944. Its totient is φ = 821327040.

The previous prime is 961765699. The next prime is 961765757. The reversal of 961765721 is 127567169.

961765721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 961765721 - 2¹⁰ = 961764697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961764721) 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, 251600 + ... + 255393.

It is an arithmetic number, because the mean of its divisors is an integer number (137902368).

Almost surely, 2^961765721 is an apocalyptic number.

It is an amenable number.

961765721 is a deficient number, since it is larger than the sum of its proper divisors (141453223).

961765721 is a wasteful number, since it uses less digits than its factorization.

961765721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507271.

The product of its digits is 158760, while the sum is 44.

The square root of 961765721 is about 31012.3478795141. The cubic root of 961765721 is about 987.0892707536.

The spelling of 961765721 in words is "nine hundred sixty-one million, seven hundred sixty-five thousand, seven hundred twenty-one".