81852621 has 8 divisors (see below), whose sum is σ = 112086624. Its totient is φ = 53093520.

The previous prime is 81852601. The next prime is 81852649. The reversal of 81852621 is 12625818.

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

It is not a de Polignac number, because 81852621 - 2⁹ = 81852109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81852601) 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, 368595 + ... + 368816.

It is an arithmetic number, because the mean of its divisors is an integer number (14010828).

Almost surely, 2^81852621 is an apocalyptic number.

It is an amenable number.

81852621 is a deficient number, since it is larger than the sum of its proper divisors (30234003).

81852621 is a wasteful number, since it uses less digits than its factorization.

81852621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737451.

The product of its digits is 7680, while the sum is 33.

The square root of 81852621 is about 9047.2438344504. The cubic root of 81852621 is about 434.1877138954.

The spelling of 81852621 in words is "eighty-one million, eight hundred fifty-two thousand, six hundred twenty-one".