81354337 has 4 divisors (see below), whose sum is σ = 81939760. Its totient is φ = 80768916.

The previous prime is 81354331. The next prime is 81354353. The reversal of 81354337 is 73345318.

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 81354337 - 2¹¹ = 81352289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81354331) 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, 292503 + ... + 292780.

It is an arithmetic number, because the mean of its divisors is an integer number (20484940).

Almost surely, 2^81354337 is an apocalyptic number.

It is an amenable number.

81354337 is a deficient number, since it is larger than the sum of its proper divisors (585423).

81354337 is a wasteful number, since it uses less digits than its factorization.

81354337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585422.

The product of its digits is 30240, while the sum is 34.

The square root of 81354337 is about 9019.6639072640. The cubic root of 81354337 is about 433.3048698595.

The spelling of 81354337 in words is "eighty-one million, three hundred fifty-four thousand, three hundred thirty-seven".