72691243 has 2 divisors, whose sum is σ = 72691244. Its totient is φ = 72691242.

The previous prime is 72691231. The next prime is 72691261. The reversal of 72691243 is 34219627.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72691243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72691199 and 72691208.

It is not a weakly prime, because it can be changed into another prime (72691043) 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, 36345621 + 36345622.

It is an arithmetic number, because the mean of its divisors is an integer number (36345622).

Almost surely, 2^72691243 is an apocalyptic number.

72691243 is a deficient number, since it is larger than the sum of its proper divisors (1).

72691243 is an equidigital number, since it uses as much as digits as its factorization.

72691243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 72691243 is about 8525.9159625227. The cubic root of 72691243 is about 417.3438631134.

The spelling of 72691243 in words is "seventy-two million, six hundred ninety-one thousand, two hundred forty-three".