81374349 has 32 divisors (see below), whose sum is σ = 130662400. Its totient is φ = 44982000.

The previous prime is 81374333. The next prime is 81374369. The reversal of 81374349 is 94347318.

It is not a de Polignac number, because 81374349 - 2⁴ = 81374333 is a prime.

It is a super-3 number, since 3×81374349³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

Its product of digits (72576) is a multiple of the sum of its prime divisors (2592).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81374329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30624 + ... + 33174.

It is an arithmetic number, because the mean of its divisors is an integer number (4083200).

Almost surely, 2^81374349 is an apocalyptic number.

It is an amenable number.

81374349 is a deficient number, since it is larger than the sum of its proper divisors (49288051).

81374349 is a wasteful number, since it uses less digits than its factorization.

81374349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 2592 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 81374349 is about 9020.7731930251. The cubic root of 81374349 is about 433.3403958744.

The spelling of 81374349 in words is "eighty-one million, three hundred seventy-four thousand, three hundred forty-nine".