72997543 has 2 divisors, whose sum is σ = 72997544. Its totient is φ = 72997542.

The previous prime is 72997517. The next prime is 72997549. The reversal of 72997543 is 34579927.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72997543 - 2⁵ = 72997511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72997493 and 72997502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72997549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36498771 + 36498772.

It is an arithmetic number, because the mean of its divisors is an integer number (36498772).

Almost surely, 2^72997543 is an apocalyptic number.

72997543 is a deficient number, since it is larger than the sum of its proper divisors (1).

72997543 is an equidigital number, since it uses as much as digits as its factorization.

72997543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The square root of 72997543 is about 8543.8599590583. The cubic root of 72997543 is about 417.9292307104.

The spelling of 72997543 in words is "seventy-two million, nine hundred ninety-seven thousand, five hundred forty-three".