89193721 has 4 divisors (see below), whose sum is σ = 89216100. Its totient is φ = 89171344.

The previous prime is 89193703. The next prime is 89193749. The reversal of 89193721 is 12739198.

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 77633721 + 11560000 = 8811^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 89193721 - 2¹³ = 89185529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89193761) 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, 3406 + ... + 13783.

It is an arithmetic number, because the mean of its divisors is an integer number (22304025).

Almost surely, 2^89193721 is an apocalyptic number.

It is an amenable number.

89193721 is a deficient number, since it is larger than the sum of its proper divisors (22379).

89193721 is a wasteful number, since it uses less digits than its factorization.

89193721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22378.

The product of its digits is 27216, while the sum is 40.

The square root of 89193721 is about 9444.2427435978. The cubic root of 89193721 is about 446.7982129690.

The spelling of 89193721 in words is "eighty-nine million, one hundred ninety-three thousand, seven hundred twenty-one".