79873181 has 6 divisors (see below), whose sum is σ = 83497470. Its totient is φ = 76399928.

The previous prime is 79873177. The next prime is 79873219. The reversal of 79873181 is 18137897.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 13205956 = 8165^2 + 3634^2 .

It is not a de Polignac number, because 79873181 - 2² = 79873177 is a prime.

It is a super-2 number, since 2×79873181² = 12759450086117522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79873481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74966 + ... + 76023.

It is an arithmetic number, because the mean of its divisors is an integer number (13916245).

Almost surely, 2^79873181 is an apocalyptic number.

It is an amenable number.

79873181 is a deficient number, since it is larger than the sum of its proper divisors (3624289).

79873181 is a wasteful number, since it uses less digits than its factorization.

79873181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151035 (or 151012 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The square root of 79873181 is about 8937.1797005543. The cubic root of 79873181 is about 430.6591315440.

The spelling of 79873181 in words is "seventy-nine million, eight hundred seventy-three thousand, one hundred eighty-one".