945797721 has 16 divisors (see below), whose sum is σ = 1385754048. Its totient is φ = 569024000.

The previous prime is 945797689. The next prime is 945797729. The reversal of 945797721 is 127797549.

It is a cyclic number.

It is not a de Polignac number, because 945797721 - 2⁵ = 945797689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (945797729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100080 + ... + 109121.

It is an arithmetic number, because the mean of its divisors is an integer number (86609628).

Almost surely, 2^945797721 is an apocalyptic number.

It is an amenable number.

945797721 is a deficient number, since it is larger than the sum of its proper divisors (439956327).

945797721 is a wasteful number, since it uses less digits than its factorization.

945797721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209352.

The product of its digits is 1111320, while the sum is 51.

The square root of 945797721 is about 30753.8244938739. The cubic root of 945797721 is about 981.5959421986.

The spelling of 945797721 in words is "nine hundred forty-five million, seven hundred ninety-seven thousand, seven hundred twenty-one".