81093371 has 4 divisors (see below), whose sum is σ = 81253200. Its totient is φ = 80933544.

The previous prime is 81093361. The next prime is 81093373. The reversal of 81093371 is 17339018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81093371 - 2¹⁸ = 80831227 is a prime.

It is a super-2 number, since 2×81093371² = 13152269640287282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81093373) 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, 79151 + ... + 80168.

It is an arithmetic number, because the mean of its divisors is an integer number (20313300).

Almost surely, 2^81093371 is an apocalyptic number.

81093371 is a deficient number, since it is larger than the sum of its proper divisors (159829).

81093371 is a wasteful number, since it uses less digits than its factorization.

81093371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159828.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 81093371 is about 9005.1857837582. The cubic root of 81093371 is about 432.8410594551.

The spelling of 81093371 in words is "eighty-one million, ninety-three thousand, three hundred seventy-one".