89705572921 has 2 divisors, whose sum is σ = 89705572922. Its totient is φ = 89705572920.

The previous prime is 89705572843. The next prime is 89705572927. The reversal of 89705572921 is 12927550798.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74304762921 + 15400810000 = 272589^2 + 124100^2 .

It is a cyclic number.

It is not a de Polignac number, because 89705572921 - 2⁷ = 89705572793 is a prime.

It is not a weakly prime, because it can be changed into another prime (89705572927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44852786460 + 44852786461.

It is an arithmetic number, because the mean of its divisors is an integer number (44852786461).

Almost surely, 2^89705572921 is an apocalyptic number.

It is an amenable number.

89705572921 is a deficient number, since it is larger than the sum of its proper divisors (1).

89705572921 is an equidigital number, since it uses as much as digits as its factorization.

89705572921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 89705572921 in words is "eighty-nine billion, seven hundred five million, five hundred seventy-two thousand, nine hundred twenty-one".