89389137581 has 4 divisors (see below), whose sum is σ = 89413086972. Its totient is φ = 89365188192.

The previous prime is 89389137533. The next prime is 89389137671. The reversal of 89389137581 is 18573198398.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38441876356 + 50947261225 = 196066^2 + 225715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89389137581 is a prime.

It is a super-2 number, since 2×89389137581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89389137181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11969096 + ... + 11976561.

It is an arithmetic number, because the mean of its divisors is an integer number (22353271743).

Almost surely, 2^89389137581 is an apocalyptic number.

It is an amenable number.

89389137581 is a deficient number, since it is larger than the sum of its proper divisors (23949391).

89389137581 is a wasteful number, since it uses less digits than its factorization.

89389137581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23949390.

The product of its digits is 13063680, while the sum is 62.

The spelling of 89389137581 in words is "eighty-nine billion, three hundred eighty-nine million, one hundred thirty-seven thousand, five hundred eighty-one".