72131121197 has 2 divisors, whose sum is σ = 72131121198. Its totient is φ = 72131121196.

The previous prime is 72131121151. The next prime is 72131121241. The reversal of 72131121197 is 79112113127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71368588201 + 762532996 = 267149^2 + 27614^2 .

It is a cyclic number.

It is not a de Polignac number, because 72131121197 - 2⁶ = 72131121133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72131121107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36065560598 + 36065560599.

It is an arithmetic number, because the mean of its divisors is an integer number (36065560599).

Almost surely, 2^72131121197 is an apocalyptic number.

It is an amenable number.

72131121197 is a deficient number, since it is larger than the sum of its proper divisors (1).

72131121197 is an equidigital number, since it uses as much as digits as its factorization.

72131121197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 35.

The spelling of 72131121197 in words is "seventy-two billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred ninety-seven".