72543397 has 2 divisors, whose sum is σ = 72543398. Its totient is φ = 72543396.

The previous prime is 72543353. The next prime is 72543407. The reversal of 72543397 is 79334527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72437121 + 106276 = 8511^2 + 326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72543397 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 (79543397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36271698 + 36271699.

It is an arithmetic number, because the mean of its divisors is an integer number (36271699).

Almost surely, 2^72543397 is an apocalyptic number.

It is an amenable number.

72543397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72543397 is an equidigital number, since it uses as much as digits as its factorization.

72543397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 40.

The square root of 72543397 is about 8517.2411613151. The cubic root of 72543397 is about 417.0607272194.

The spelling of 72543397 in words is "seventy-two million, five hundred forty-three thousand, three hundred ninety-seven".