89312821 has 8 divisors (see below), whose sum is σ = 96716984. Its totient is φ = 81984960.

The previous prime is 89312813. The next prime is 89312851. The reversal of 89312821 is 12821398.

It can be written as a sum of positive squares in 4 ways, for example, as 18584721 + 70728100 = 4311^2 + 8410^2 .

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 89312821 - 2³ = 89312813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89312851) 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, 16626 + ... + 21331.

It is an arithmetic number, because the mean of its divisors is an integer number (12089623).

Almost surely, 2^89312821 is an apocalyptic number.

It is an amenable number.

89312821 is a deficient number, since it is larger than the sum of its proper divisors (7404163).

89312821 is a wasteful number, since it uses less digits than its factorization.

89312821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38151.

The product of its digits is 6912, while the sum is 34.

The square root of 89312821 is about 9450.5460688788. The cubic root of 89312821 is about 446.9969937755.

It can be divided in two parts, 8931 and 2821, that multiplied together give a triangular number (25194351 = T₇₀₉₈).

The spelling of 89312821 in words is "eighty-nine million, three hundred twelve thousand, eight hundred twenty-one".