81107349 has 4 divisors (see below), whose sum is σ = 108143136. Its totient is φ = 54071564.

The previous prime is 81107339. The next prime is 81107393. The reversal of 81107349 is 94370118.

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 81107349 - 2¹³ = 81099157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81107339) 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, 13517889 + ... + 13517894.

It is an arithmetic number, because the mean of its divisors is an integer number (27035784).

Almost surely, 2^81107349 is an apocalyptic number.

It is an amenable number.

81107349 is a deficient number, since it is larger than the sum of its proper divisors (27035787).

81107349 is a wasteful number, since it uses less digits than its factorization.

81107349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27035786.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81107349 is about 9005.9618586801. The cubic root of 81107349 is about 432.8659275163.

The spelling of 81107349 in words is "eighty-one million, one hundred seven thousand, three hundred forty-nine".