81334979 has 8 divisors (see below), whose sum is σ = 91591680. Its totient is φ = 71555400.

The previous prime is 81334963. The next prime is 81334993. The reversal of 81334979 is 97943318.

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 81334979 - 2⁴ = 81334963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81336979) 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, 118919 + ... + 119600.

It is an arithmetic number, because the mean of its divisors is an integer number (11448960).

Almost surely, 2^81334979 is an apocalyptic number.

81334979 is a deficient number, since it is larger than the sum of its proper divisors (10256701).

81334979 is a wasteful number, since it uses less digits than its factorization.

81334979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238561.

The product of its digits is 163296, while the sum is 44.

The square root of 81334979 is about 9018.5907435696. The cubic root of 81334979 is about 433.2704993049.

The spelling of 81334979 in words is "eighty-one million, three hundred thirty-four thousand, nine hundred seventy-nine".