81745311 has 8 divisors (see below), whose sum is σ = 109035520. Its totient is φ = 54475992.

The previous prime is 81745309. The next prime is 81745319. The reversal of 81745311 is 11354718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81745311 - 2¹ = 81745309 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 (81745319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12696 + ... + 18018.

It is an arithmetic number, because the mean of its divisors is an integer number (13629440).

Almost surely, 2^81745311 is an apocalyptic number.

81745311 is a deficient number, since it is larger than the sum of its proper divisors (27290209).

81745311 is a wasteful number, since it uses less digits than its factorization.

81745311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10445.

The product of its digits is 3360, while the sum is 30.

The square root of 81745311 is about 9041.3113540017. The cubic root of 81745311 is about 433.9978887394.

The spelling of 81745311 in words is "eighty-one million, seven hundred forty-five thousand, three hundred eleven".