72111491 has 2 divisors, whose sum is σ = 72111492. Its totient is φ = 72111490.

The previous prime is 72111469. The next prime is 72111493. The reversal of 72111491 is 19411127.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72111491 is a prime.

Together with 72111493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72111491.

It is not a weakly prime, because it can be changed into another prime (72111493) 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, 36055745 + 36055746.

It is an arithmetic number, because the mean of its divisors is an integer number (36055746).

Almost surely, 2^72111491 is an apocalyptic number.

72111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72111491 is an equidigital number, since it uses as much as digits as its factorization.

72111491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 26.

The square root of 72111491 is about 8491.8485031235. The cubic root of 72111491 is about 416.2313859298.

The spelling of 72111491 in words is "seventy-two million, one hundred eleven thousand, four hundred ninety-one".