88521689 has 2 divisors, whose sum is σ = 88521690. Its totient is φ = 88521688.

The previous prime is 88521679. The next prime is 88521731. The reversal of 88521689 is 98612588.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 537289 = 9380^2 + 733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88521689 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (88521619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44260844 + 44260845.

It is an arithmetic number, because the mean of its divisors is an integer number (44260845).

Almost surely, 2^88521689 is an apocalyptic number.

It is an amenable number.

88521689 is a deficient number, since it is larger than the sum of its proper divisors (1).

88521689 is an equidigital number, since it uses as much as digits as its factorization.

88521689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 88521689 is about 9408.5965478386. The cubic root of 88521689 is about 445.6732459581.

The spelling of 88521689 in words is "eighty-eight million, five hundred twenty-one thousand, six hundred eighty-nine".