79970197 has 4 divisors (see below), whose sum is σ = 82727820. Its totient is φ = 77212576.

The previous prime is 79970179. The next prime is 79970243. The reversal of 79970197 is 79107997.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21585316 + 58384881 = 4646^2 + 7641^2 .

It is a cyclic number.

It is not a de Polignac number, because 79970197 - 2¹⁹ = 79445909 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79970197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79973197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378768 + ... + 1378825.

It is an arithmetic number, because the mean of its divisors is an integer number (20681955).

Almost surely, 2^79970197 is an apocalyptic number.

It is an amenable number.

79970197 is a deficient number, since it is larger than the sum of its proper divisors (2757623).

79970197 is a wasteful number, since it uses less digits than its factorization.

79970197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757622.

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 79970197 is about 8942.6057164565. The cubic root of 79970197 is about 430.8334241796.

The spelling of 79970197 in words is "seventy-nine million, nine hundred seventy thousand, one hundred ninety-seven".