89999999993 has 2 divisors, whose sum is σ = 89999999994. Its totient is φ = 89999999992.

The previous prime is 89999999981. The next prime is 90000000019. The reversal of 89999999993 is 39999999998.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57500203264 + 32499796729 = 239792^2 + 180277^2 .

It is a cyclic number.

It is not a de Polignac number, because 89999999993 - 2³⁴ = 72820130809 is a prime.

It is not a weakly prime, because it can be changed into another prime (89999999923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44999999996 + 44999999997.

It is an arithmetic number, because the mean of its divisors is an integer number (44999999997).

Almost surely, 2^89999999993 is an apocalyptic number.

It is an amenable number.

89999999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

89999999993 is an equidigital number, since it uses as much as digits as its factorization.

89999999993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9298091736, while the sum is 92.

It can be divided in two parts, 8 and 9999999993, that added together give a palindrome (10000000001).

The spelling of 89999999993 in words is "eighty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".