81337441 has 4 divisors (see below), whose sum is σ = 82097712. Its totient is φ = 80577172.

The previous prime is 81337411. The next prime is 81337511. The reversal of 81337441 is 14473318.

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 81337441 - 2⁵ = 81337409 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81337411) 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, 379975 + ... + 380188.

It is an arithmetic number, because the mean of its divisors is an integer number (20524428).

Almost surely, 2^81337441 is an apocalyptic number.

It is an amenable number.

81337441 is a deficient number, since it is larger than the sum of its proper divisors (760271).

81337441 is a wasteful number, since it uses less digits than its factorization.

81337441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760270.

The product of its digits is 8064, while the sum is 31.

The square root of 81337441 is about 9018.7272383635. The cubic root of 81337441 is about 433.2748709427.

The spelling of 81337441 in words is "eighty-one million, three hundred thirty-seven thousand, four hundred forty-one".