81614881 has 4 divisors (see below), whose sum is σ = 81637632. Its totient is φ = 81592132.

The previous prime is 81614867. The next prime is 81614893. The reversal of 81614881 is 18841618.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18841618 = 2 ⋅9420809.

It is a cyclic number.

It is not a de Polignac number, because 81614881 - 2⁵ = 81614849 is a prime.

It is a super-2 number, since 2×81614881² = 13321977601288322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81614881.

It is not an unprimeable number, because it can be changed into a prime (81614801) 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, 4681 + ... + 13606.

It is an arithmetic number, because the mean of its divisors is an integer number (20409408).

Almost surely, 2^81614881 is an apocalyptic number.

It is an amenable number.

81614881 is a deficient number, since it is larger than the sum of its proper divisors (22751).

81614881 is a wasteful number, since it uses less digits than its factorization.

81614881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22750.

The product of its digits is 12288, while the sum is 37.

The square root of 81614881 is about 9034.0954721544. The cubic root of 81614881 is about 433.7669418426.

The spelling of 81614881 in words is "eighty-one million, six hundred fourteen thousand, eight hundred eighty-one".