89811973 has 4 divisors (see below), whose sum is σ = 91042348. Its totient is φ = 88581600.

The previous prime is 89811961. The next prime is 89811977. The reversal of 89811973 is 37911898.

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 69588964 + 20223009 = 8342^2 + 4497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89811973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89811977) 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, 615078 + ... + 615223.

It is an arithmetic number, because the mean of its divisors is an integer number (22760587).

Almost surely, 2^89811973 is an apocalyptic number.

It is an amenable number.

89811973 is a deficient number, since it is larger than the sum of its proper divisors (1230375).

89811973 is a wasteful number, since it uses less digits than its factorization.

89811973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230374.

The product of its digits is 108864, while the sum is 46.

The square root of 89811973 is about 9476.9179061549. The cubic root of 89811973 is about 447.8281737026.

The spelling of 89811973 in words is "eighty-nine million, eight hundred eleven thousand, nine hundred seventy-three".