81171379 has 8 divisors (see below), whose sum is σ = 86032800. Its totient is φ = 76319616.

The previous prime is 81171329. The next prime is 81171407. The reversal of 81171379 is 97317118.

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 81171379 - 2⁹ = 81170867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81171329) 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, 22077 + ... + 25489.

It is an arithmetic number, because the mean of its divisors is an integer number (10754100).

Almost surely, 2^81171379 is an apocalyptic number.

81171379 is a deficient number, since it is larger than the sum of its proper divisors (4861421).

81171379 is a wasteful number, since it uses less digits than its factorization.

81171379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4829.

The product of its digits is 10584, while the sum is 37.

The square root of 81171379 is about 9009.5160247374. The cubic root of 81171379 is about 432.9798058735.

The spelling of 81171379 in words is "eighty-one million, one hundred seventy-one thousand, three hundred seventy-nine".