89781959 has 2 divisors, whose sum is σ = 89781960. Its totient is φ = 89781958.

The previous prime is 89781931. The next prime is 89781961. The reversal of 89781959 is 95918798.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89781959 is a prime.

Together with 89781961, 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 (89781919) 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, 44890979 + 44890980.

It is an arithmetic number, because the mean of its divisors is an integer number (44890980).

Almost surely, 2^89781959 is an apocalyptic number.

89781959 is a deficient number, since it is larger than the sum of its proper divisors (1).

89781959 is an equidigital number, since it uses as much as digits as its factorization.

89781959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 56.

The square root of 89781959 is about 9475.3342421257. The cubic root of 89781959 is about 447.7782820163.

The spelling of 89781959 in words is "eighty-nine million, seven hundred eighty-one thousand, nine hundred fifty-nine".