89125721 has 2 divisors, whose sum is σ = 89125722. Its totient is φ = 89125720.

The previous prime is 89125717. The next prime is 89125723. The reversal of 89125721 is 12752198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85303696 + 3822025 = 9236^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 89125721 - 2² = 89125717 is a prime.

Together with 89125723, 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 (89125723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44562860 + 44562861.

It is an arithmetic number, because the mean of its divisors is an integer number (44562861).

Almost surely, 2^89125721 is an apocalyptic number.

It is an amenable number.

89125721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89125721 is an equidigital number, since it uses as much as digits as its factorization.

89125721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 89125721 is about 9440.6419802893. The cubic root of 89125721 is about 446.6846399416.

The spelling of 89125721 in words is "eighty-nine million, one hundred twenty-five thousand, seven hundred twenty-one".