945775721 has 8 divisors (see below), whose sum is σ = 1032609600. Its totient is φ = 859084240.

The previous prime is 945775717. The next prime is 945775757. The reversal of 945775721 is 127577549.

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 945775721 - 2² = 945775717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (945775771) 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, 21461 + ... + 48498.

It is an arithmetic number, because the mean of its divisors is an integer number (129076200).

Almost surely, 2^945775721 is an apocalyptic number.

It is an amenable number.

945775721 is a deficient number, since it is larger than the sum of its proper divisors (86833879).

945775721 is a wasteful number, since it uses less digits than its factorization.

945775721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71199.

The product of its digits is 617400, while the sum is 47.

The square root of 945775721 is about 30753.4668127026. The cubic root of 945775721 is about 981.5883312413.

The spelling of 945775721 in words is "nine hundred forty-five million, seven hundred seventy-five thousand, seven hundred twenty-one".