81349079 has 8 divisors (see below), whose sum is σ = 93563808. Its totient is φ = 69282720.

The previous prime is 81349069. The next prime is 81349123. The reversal of 81349079 is 97094318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81349079 - 2²⁴ = 64571863 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 (81349069) 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, 35912 + ... + 38109.

It is an arithmetic number, because the mean of its divisors is an integer number (11695476).

Almost surely, 2^81349079 is an apocalyptic number.

81349079 is a deficient number, since it is larger than the sum of its proper divisors (12214729).

81349079 is a wasteful number, since it uses less digits than its factorization.

81349079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74185.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 81349079 is about 9019.3724282790. The cubic root of 81349079 is about 433.2955347043.

The spelling of 81349079 in words is "eighty-one million, three hundred forty-nine thousand, seventy-nine".