81694411 has 4 divisors (see below), whose sum is σ = 81721024. Its totient is φ = 81667800.

The previous prime is 81694381. The next prime is 81694423. The reversal of 81694411 is 11449618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11449618 = 2 ⋅5724809.

It is a cyclic number.

It is not a de Polignac number, because 81694411 - 2¹³ = 81686219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81694451) 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, 7995 + ... + 15076.

It is an arithmetic number, because the mean of its divisors is an integer number (20430256).

Almost surely, 2^81694411 is an apocalyptic number.

81694411 is a deficient number, since it is larger than the sum of its proper divisors (26613).

81694411 is a wasteful number, since it uses less digits than its factorization.

81694411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26612.

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

The square root of 81694411 is about 9038.4960585266. The cubic root of 81694411 is about 433.9077915059.

The spelling of 81694411 in words is "eighty-one million, six hundred ninety-four thousand, four hundred eleven".