89487721 has 2 divisors, whose sum is σ = 89487722. Its totient is φ = 89487720.

The previous prime is 89487709. The next prime is 89487781. The reversal of 89487721 is 12778498.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 19263321 = 8380^2 + 4389^2 .

It is a cyclic number.

It is not a de Polignac number, because 89487721 - 2²⁵ = 55933289 is a prime.

It is not a weakly prime, because it can be changed into another prime (89487781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44743860 + 44743861.

It is an arithmetic number, because the mean of its divisors is an integer number (44743861).

Almost surely, 2^89487721 is an apocalyptic number.

It is an amenable number.

89487721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89487721 is an equidigital number, since it uses as much as digits as its factorization.

89487721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 89487721 is about 9459.7949766367. The cubic root of 89487721 is about 447.2885860912.

The spelling of 89487721 in words is "eighty-nine million, four hundred eighty-seven thousand, seven hundred twenty-one".