89569721 has 4 divisors (see below), whose sum is σ = 89716452. Its totient is φ = 89422992.

The previous prime is 89569709. The next prime is 89569723. The reversal of 89569721 is 12796598.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29041321 + 60528400 = 5389^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 89569721 - 2⁶ = 89569657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89569723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72446 + ... + 73671.

It is an arithmetic number, because the mean of its divisors is an integer number (22429113).

Almost surely, 2^89569721 is an apocalyptic number.

It is an amenable number.

89569721 is a deficient number, since it is larger than the sum of its proper divisors (146731).

89569721 is a wasteful number, since it uses less digits than its factorization.

89569721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146730.

The product of its digits is 272160, while the sum is 47.

The square root of 89569721 is about 9464.1281162081. The cubic root of 89569721 is about 447.4251652272.

The spelling of 89569721 in words is "eighty-nine million, five hundred sixty-nine thousand, seven hundred twenty-one".