89137561 has 4 divisors (see below), whose sum is σ = 92211300. Its totient is φ = 86063824.

The previous prime is 89137553. The next prime is 89137597. The reversal of 89137561 is 16573198.

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 43494025 + 45643536 = 6595^2 + 6756^2 .

It is a cyclic number.

It is not a de Polignac number, because 89137561 - 2³ = 89137553 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (89137501) 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, 1536826 + ... + 1536883.

It is an arithmetic number, because the mean of its divisors is an integer number (23052825).

Almost surely, 2^89137561 is an apocalyptic number.

It is an amenable number.

89137561 is a deficient number, since it is larger than the sum of its proper divisors (3073739).

89137561 is a wasteful number, since it uses less digits than its factorization.

89137561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073738.

The product of its digits is 45360, while the sum is 40.

The square root of 89137561 is about 9441.2690354634. The cubic root of 89137561 is about 446.7044191625.

It can be divided in two parts, 89137 and 561, that added together give a palindrome (89698).

The spelling of 89137561 in words is "eighty-nine million, one hundred thirty-seven thousand, five hundred sixty-one".