89121887 has 2 divisors, whose sum is σ = 89121888. Its totient is φ = 89121886.

The previous prime is 89121821. The next prime is 89121889. The reversal of 89121887 is 78812198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89121887 - 2¹⁶ = 89056351 is a prime.

It is a super-3 number, since 3×89121887³ (a number of 25 digits) contains 333 as substring.

Together with 89121889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89121889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44560943 + 44560944.

It is an arithmetic number, because the mean of its divisors is an integer number (44560944).

Almost surely, 2^89121887 is an apocalyptic number.

89121887 is a deficient number, since it is larger than the sum of its proper divisors (1).

89121887 is an equidigital number, since it uses as much as digits as its factorization.

89121887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 44.

The square root of 89121887 is about 9440.4389198808. The cubic root of 89121887 is about 446.6782347070.

The spelling of 89121887 in words is "eighty-nine million, one hundred twenty-one thousand, eight hundred eighty-seven".