89018949809 has 2 divisors, whose sum is σ = 89018949810. Its totient is φ = 89018949808.

The previous prime is 89018949793. The next prime is 89018949839. The reversal of 89018949809 is 90894981098.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67679583409 + 21339366400 = 260153^2 + 146080^2 .

It is a cyclic number.

It is not a de Polignac number, because 89018949809 - 2⁴ = 89018949793 is a prime.

It is a super-2 number, since 2×89018949809² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89018949839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44509474904 + 44509474905.

It is an arithmetic number, because the mean of its divisors is an integer number (44509474905).

Almost surely, 2^89018949809 is an apocalyptic number.

It is an amenable number.

89018949809 is a deficient number, since it is larger than the sum of its proper divisors (1).

89018949809 is an equidigital number, since it uses as much as digits as its factorization.

89018949809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 65.

The spelling of 89018949809 in words is "eighty-nine billion, eighteen million, nine hundred forty-nine thousand, eight hundred nine".