89947521 has 6 divisors (see below), whose sum is σ = 129924210. Its totient is φ = 59965008.

The previous prime is 89947513. The next prime is 89947537. The reversal of 89947521 is 12574998.

89947521 is a `hidden beast` number, since 89 + 9 + 47 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 9217296 = 8985^2 + 3036^2 .

It is not a de Polignac number, because 89947521 - 2³ = 89947513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89947541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4997076 + ... + 4997093.

It is an arithmetic number, because the mean of its divisors is an integer number (21654035).

Almost surely, 2^89947521 is an apocalyptic number.

It is an amenable number.

89947521 is a deficient number, since it is larger than the sum of its proper divisors (39976689).

89947521 is a wasteful number, since it uses less digits than its factorization.

89947521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9994175 (or 9994172 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 89947521 is about 9484.0666910350. The cubic root of 89947521 is about 448.0533541499.

The spelling of 89947521 in words is "eighty-nine million, nine hundred forty-seven thousand, five hundred twenty-one".