89815216291 has 2 divisors, whose sum is σ = 89815216292. Its totient is φ = 89815216290.

The previous prime is 89815216279. The next prime is 89815216301. The reversal of 89815216291 is 19261251898.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89815216291 - 2⁷ = 89815216163 is a prime.

It is a super-2 number, since 2×89815216291² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89815216091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44907608145 + 44907608146.

It is an arithmetic number, because the mean of its divisors is an integer number (44907608146).

Almost surely, 2^89815216291 is an apocalyptic number.

89815216291 is a deficient number, since it is larger than the sum of its proper divisors (1).

89815216291 is an equidigital number, since it uses as much as digits as its factorization.

89815216291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 52.

The spelling of 89815216291 in words is "eighty-nine billion, eight hundred fifteen million, two hundred sixteen thousand, two hundred ninety-one".