89516821 has 2 divisors, whose sum is σ = 89516822. Its totient is φ = 89516820.

The previous prime is 89516813. The next prime is 89516827. The reversal of 89516821 is 12861598.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62331025 + 27185796 = 7895^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 89516821 - 2³ = 89516813 is a prime.

It is a super-2 number, since 2×89516821² = 16026522483892082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89516827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44758410 + 44758411.

It is an arithmetic number, because the mean of its divisors is an integer number (44758411).

Almost surely, 2^89516821 is an apocalyptic number.

It is an amenable number.

89516821 is a deficient number, since it is larger than the sum of its proper divisors (1).

89516821 is an equidigital number, since it uses as much as digits as its factorization.

89516821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 40.

The square root of 89516821 is about 9461.3329399192. The cubic root of 89516821 is about 447.3370645755.

The spelling of 89516821 in words is "eighty-nine million, five hundred sixteen thousand, eight hundred twenty-one".