72126511 has 2 divisors, whose sum is σ = 72126512. Its totient is φ = 72126510.

The previous prime is 72126479. The next prime is 72126517. The reversal of 72126511 is 11562127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72126511 - 2⁵ = 72126479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72126517) 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, 36063255 + 36063256.

It is an arithmetic number, because the mean of its divisors is an integer number (36063256).

Almost surely, 2^72126511 is an apocalyptic number.

72126511 is a deficient number, since it is larger than the sum of its proper divisors (1).

72126511 is an equidigital number, since it uses as much as digits as its factorization.

72126511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 72126511 is about 8492.7328346063. The cubic root of 72126511 is about 416.2602826716.

Adding to 72126511 its reverse (11562127), we get a palindrome (83688638).

The spelling of 72126511 in words is "seventy-two million, one hundred twenty-six thousand, five hundred eleven".