72018197 has 2 divisors, whose sum is σ = 72018198. Its totient is φ = 72018196.

The previous prime is 72018161. The next prime is 72018229. The reversal of 72018197 is 79181027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59691076 + 12327121 = 7726^2 + 3511^2 .

It is an emirp because it is prime and its reverse (79181027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72018197 - 2¹⁸ = 71756053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72018157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36009098 + 36009099.

It is an arithmetic number, because the mean of its divisors is an integer number (36009099).

Almost surely, 2^72018197 is an apocalyptic number.

It is an amenable number.

72018197 is a deficient number, since it is larger than the sum of its proper divisors (1).

72018197 is an equidigital number, since it uses as much as digits as its factorization.

72018197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 72018197 is about 8486.3535750050. The cubic root of 72018197 is about 416.0518091446.

The spelling of 72018197 in words is "seventy-two million, eighteen thousand, one hundred ninety-seven".