89973661 has 2 divisors, whose sum is σ = 89973662. Its totient is φ = 89973660.

The previous prime is 89973629. The next prime is 89973691. The reversal of 89973661 is 16637998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61136761 + 28836900 = 7819^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 89973661 - 2⁵ = 89973629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89973601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44986830 + 44986831.

It is an arithmetic number, because the mean of its divisors is an integer number (44986831).

Almost surely, 2^89973661 is an apocalyptic number.

It is an amenable number.

89973661 is a deficient number, since it is larger than the sum of its proper divisors (1).

89973661 is an equidigital number, since it uses as much as digits as its factorization.

89973661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 89973661 is about 9485.4446917369. Note that the first 3 decimals coincide. The cubic root of 89973661 is about 448.0967534572.

The spelling of 89973661 in words is "eighty-nine million, nine hundred seventy-three thousand, six hundred sixty-one".