81047349 has 24 divisors (see below), whose sum is σ = 119170272. Its totient is φ = 53071200.

The previous prime is 81047341. The next prime is 81047357. The reversal of 81047349 is 94374018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81047341) and next prime (81047357).

It is not a de Polignac number, because 81047349 - 2³ = 81047341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81047341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147894 + ... + 148440.

It is an arithmetic number, because the mean of its divisors is an integer number (4965428).

Almost surely, 2^81047349 is an apocalyptic number.

It is an amenable number.

81047349 is a deficient number, since it is larger than the sum of its proper divisors (38122923).

81047349 is a wasteful number, since it uses less digits than its factorization.

81047349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81047349 is about 9002.6301156940. The cubic root of 81047349 is about 432.7591621700.

The spelling of 81047349 in words is "eighty-one million, forty-seven thousand, three hundred forty-nine".