89387521 has 8 divisors (see below), whose sum is σ = 91915560. Its totient is φ = 86890752.

The previous prime is 89387491. The next prime is 89387563. The reversal of 89387521 is 12578398.

It can be written as a sum of positive squares in 4 ways, for example, as 26010000 + 63377521 = 5100^2 + 7961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 89387521 - 2⁵ = 89387489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89387321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1960 + ... + 13513.

It is an arithmetic number, because the mean of its divisors is an integer number (11489445).

Almost surely, 2^89387521 is an apocalyptic number.

It is an amenable number.

89387521 is a deficient number, since it is larger than the sum of its proper divisors (2528039).

89387521 is a wasteful number, since it uses less digits than its factorization.

89387521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15635.

The product of its digits is 120960, while the sum is 43.

The square root of 89387521 is about 9454.4973954198. The cubic root of 89387521 is about 447.1215797354.

It can be divided in two parts, 893 and 87521, that multiplied together give a triangular number (78156253 = T₁₂₅₀₂).

The spelling of 89387521 in words is "eighty-nine million, three hundred eighty-seven thousand, five hundred twenty-one".