91452821 has 8 divisors (see below), whose sum is σ = 95241984. Its totient is φ = 87716160.

The previous prime is 91452799. The next prime is 91452841. The reversal of 91452821 is 12825419.

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 91452821 - 2¹⁸ = 91190677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91452841) 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, 9551 + ... + 16556.

It is an arithmetic number, because the mean of its divisors is an integer number (11905248).

Almost surely, 2^91452821 is an apocalyptic number.

It is an amenable number.

91452821 is a deficient number, since it is larger than the sum of its proper divisors (3789163).

91452821 is a wasteful number, since it uses less digits than its factorization.

91452821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26251.

The product of its digits is 5760, while the sum is 32.

The square root of 91452821 is about 9563.0968310480. The cubic root of 91452821 is about 450.5389772398.

It can be divided in two parts, 914 and 52821, that added together give a palindrome (53735).

The spelling of 91452821 in words is "ninety-one million, four hundred fifty-two thousand, eight hundred twenty-one".