961722729 has 12 divisors (see below), whose sum is σ = 1515442032. Its totient is φ = 582862200.

The previous prime is 961722719. The next prime is 961722763. The reversal of 961722729 is 927227169.

961722729 is a `hidden beast` number, since 9 + 617 + 2 + 2 + 7 + 29 = 666.

It is not a de Polignac number, because 961722729 - 2⁹ = 961722217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (961722719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4857087 + ... + 4857284.

It is an arithmetic number, because the mean of its divisors is an integer number (126286836).

Almost surely, 2^961722729 is an apocalyptic number.

961722729 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

961722729 is a deficient number, since it is larger than the sum of its proper divisors (553719303).

961722729 is a wasteful number, since it uses less digits than its factorization.

961722729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9714388 (or 9714385 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 961722729 is about 31011.6547285049. The cubic root of 961722729 is about 987.0745625375.

The spelling of 961722729 in words is "nine hundred sixty-one million, seven hundred twenty-two thousand, seven hundred twenty-nine".