81853093 has 4 divisors (see below), whose sum is σ = 93546400. Its totient is φ = 70159788.

The previous prime is 81853091. The next prime is 81853099. The reversal of 81853093 is 39035818.

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.

It is a cyclic number.

It is not a de Polignac number, because 81853093 - 2¹ = 81853091 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81853091) 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, 5846643 + ... + 5846656.

It is an arithmetic number, because the mean of its divisors is an integer number (23386600).

Almost surely, 2^81853093 is an apocalyptic number.

It is an amenable number.

81853093 is a deficient number, since it is larger than the sum of its proper divisors (11693307).

81853093 is a wasteful number, since it uses less digits than its factorization.

81853093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11693306.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 81853093 is about 9047.2699197051. The cubic root of 81853093 is about 434.1885484694.

The spelling of 81853093 in words is "eighty-one million, eight hundred fifty-three thousand, ninety-three".