89731439557 has 4 divisors (see below), whose sum is σ = 89742891276. Its totient is φ = 89719987840.

The previous prime is 89731439549. The next prime is 89731439561. The reversal of 89731439557 is 75593413798.

It is a happy number.

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 15395598241 + 74335841316 = 124079^2 + 272646^2 .

It is a cyclic number.

It is not a de Polignac number, because 89731439557 - 2³ = 89731439549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 89731439495 and 89731439504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89731439587) 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, 5714098 + ... + 5729779.

It is an arithmetic number, because the mean of its divisors is an integer number (22435722819).

Almost surely, 2^89731439557 is an apocalyptic number.

It is an amenable number.

89731439557 is a deficient number, since it is larger than the sum of its proper divisors (11451719).

89731439557 is a wasteful number, since it uses less digits than its factorization.

89731439557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11451718.

The product of its digits is 28576800, while the sum is 61.

The spelling of 89731439557 in words is "eighty-nine billion, seven hundred thirty-one million, four hundred thirty-nine thousand, five hundred fifty-seven".