87333521 has 4 divisors (see below), whose sum is σ = 95272944. Its totient is φ = 79394100.

The previous prime is 87333487. The next prime is 87333523. The reversal of 87333521 is 12533378.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87333521 - 2⁶ = 87333457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87333523) 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, 3969695 + ... + 3969716.

It is an arithmetic number, because the mean of its divisors is an integer number (23818236).

Almost surely, 2^87333521 is an apocalyptic number.

It is an amenable number.

87333521 is a deficient number, since it is larger than the sum of its proper divisors (7939423).

87333521 is a wasteful number, since it uses less digits than its factorization.

87333521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939422.

The product of its digits is 15120, while the sum is 32.

The square root of 87333521 is about 9345.2405533512. The cubic root of 87333521 is about 443.6702652215.

Adding to 87333521 its reverse (12533378), we get a palindrome (99866899).

The spelling of 87333521 in words is "eighty-seven million, three hundred thirty-three thousand, five hundred twenty-one".