72115397 has 2 divisors, whose sum is σ = 72115398. Its totient is φ = 72115396.

The previous prime is 72115333. The next prime is 72115399. The reversal of 72115397 is 79351127.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59505796 + 12609601 = 7714^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 72115397 - 2⁶ = 72115333 is a prime.

Together with 72115399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72115399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36057698 + 36057699.

It is an arithmetic number, because the mean of its divisors is an integer number (36057699).

Almost surely, 2^72115397 is an apocalyptic number.

It is an amenable number.

72115397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72115397 is an equidigital number, since it uses as much as digits as its factorization.

72115397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 35.

The square root of 72115397 is about 8492.0784852708. The cubic root of 72115397 is about 416.2389010078.

The spelling of 72115397 in words is "seventy-two million, one hundred fifteen thousand, three hundred ninety-seven".