79329281 has 4 divisors (see below), whose sum is σ = 81174192. Its totient is φ = 77484372.

The previous prime is 79329251. The next prime is 79329311. The reversal of 79329281 is 18292397.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (79329251) and next prime (79329311).

It is a cyclic number.

It is not a de Polignac number, because 79329281 - 2¹⁰ = 79328257 is a prime.

It is a super-2 number, since 2×79329281² = 12586269647953922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79329241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922391 + ... + 922476.

It is an arithmetic number, because the mean of its divisors is an integer number (20293548).

Almost surely, 2^79329281 is an apocalyptic number.

It is an amenable number.

79329281 is a deficient number, since it is larger than the sum of its proper divisors (1844911).

79329281 is a wasteful number, since it uses less digits than its factorization.

79329281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844910.

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

The square root of 79329281 is about 8906.6986588747. The cubic root of 79329281 is about 429.6793733894.

The spelling of 79329281 in words is "seventy-nine million, three hundred twenty-nine thousand, two hundred eighty-one".