89611721 has 2 divisors, whose sum is σ = 89611722. Its totient is φ = 89611720.

The previous prime is 89611693. The next prime is 89611723. The reversal of 89611721 is 12711698.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 17106496 = 8515^2 + 4136^2 .

It is a cyclic number.

It is not a de Polignac number, because 89611721 - 2¹⁸ = 89349577 is a prime.

Together with 89611723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89611723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44805860 + 44805861.

It is an arithmetic number, because the mean of its divisors is an integer number (44805861).

Almost surely, 2^89611721 is an apocalyptic number.

It is an amenable number.

89611721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89611721 is an equidigital number, since it uses as much as digits as its factorization.

89611721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 89611721 is about 9466.3467610267. The cubic root of 89611721 is about 447.4950881144.

The spelling of 89611721 in words is "eighty-nine million, six hundred eleven thousand, seven hundred twenty-one".