89885454721 has 2 divisors, whose sum is σ = 89885454722. Its totient is φ = 89885454720.

The previous prime is 89885454689. The next prime is 89885454749. The reversal of 89885454721 is 12745458898.

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., 57938897025 + 31946557696 = 240705^2 + 178736^2 .

It is a cyclic number.

It is not a de Polignac number, because 89885454721 - 2⁵ = 89885454689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 89885454721.

It is not a weakly prime, because it can be changed into another prime (89885454751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44942727360 + 44942727361.

It is an arithmetic number, because the mean of its divisors is an integer number (44942727361).

Almost surely, 2^89885454721 is an apocalyptic number.

It is an amenable number.

89885454721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89885454721 is an equidigital number, since it uses as much as digits as its factorization.

89885454721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25804800, while the sum is 61.

The spelling of 89885454721 in words is "eighty-nine billion, eight hundred eighty-five million, four hundred fifty-four thousand, seven hundred twenty-one".