72147197 has 2 divisors, whose sum is σ = 72147198. Its totient is φ = 72147196.

The previous prime is 72147193. The next prime is 72147217. The reversal of 72147197 is 79174127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57851236 + 14295961 = 7606^2 + 3781^2 .

It is a cyclic number.

It is not a de Polignac number, because 72147197 - 2² = 72147193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72147197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72147193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36073598 + 36073599.

It is an arithmetic number, because the mean of its divisors is an integer number (36073599).

Almost surely, 2^72147197 is an apocalyptic number.

It is an amenable number.

72147197 is a deficient number, since it is larger than the sum of its proper divisors (1).

72147197 is an equidigital number, since it uses as much as digits as its factorization.

72147197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 38.

The square root of 72147197 is about 8493.9506120533. The cubic root of 72147197 is about 416.3000735752.

The spelling of 72147197 in words is "seventy-two million, one hundred forty-seven thousand, one hundred ninety-seven".