89515021 has 2 divisors, whose sum is σ = 89515022. Its totient is φ = 89515020.

The previous prime is 89515007. The next prime is 89515033. The reversal of 89515021 is 12051598.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89302500 + 212521 = 9450^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 89515021 - 2⁵ = 89514989 is a prime.

It is equal to p_5190637 and since 89515021 and 5190637 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89515001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44757510 + 44757511.

It is an arithmetic number, because the mean of its divisors is an integer number (44757511).

Almost surely, 2^89515021 is an apocalyptic number.

It is an amenable number.

89515021 is a deficient number, since it is larger than the sum of its proper divisors (1).

89515021 is an equidigital number, since it uses as much as digits as its factorization.

89515021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 89515021 is about 9461.2378154235. The cubic root of 89515021 is about 447.3340662112.

The spelling of 89515021 in words is "eighty-nine million, five hundred fifteen thousand, twenty-one".