89781619 has 2 divisors, whose sum is σ = 89781620. Its totient is φ = 89781618.

The previous prime is 89781613. The next prime is 89781649. The reversal of 89781619 is 91618798.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89781619 - 2⁷ = 89781491 is a prime.

It is a super-2 number, since 2×89781619² = 16121478220522322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89781613) 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, 44890809 + 44890810.

It is an arithmetic number, because the mean of its divisors is an integer number (44890810).

Almost surely, 2^89781619 is an apocalyptic number.

89781619 is a deficient number, since it is larger than the sum of its proper divisors (1).

89781619 is an equidigital number, since it uses as much as digits as its factorization.

89781619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 49.

The square root of 89781619 is about 9475.3163007891. The cubic root of 89781619 is about 447.7777167772. Note that the first 4 decimals are identical.

The spelling of 89781619 in words is "eighty-nine million, seven hundred eighty-one thousand, six hundred nineteen".