72789131 has 2 divisors, whose sum is σ = 72789132. Its totient is φ = 72789130.

The previous prime is 72789113. The next prime is 72789151. The reversal of 72789131 is 13198727.

Together with previous prime (72789113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13198727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72789131 is a prime.

It is a super-2 number, since 2×72789131² = 10596515183470322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72789151) 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, 36394565 + 36394566.

It is an arithmetic number, because the mean of its divisors is an integer number (36394566).

Almost surely, 2^72789131 is an apocalyptic number.

72789131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72789131 is an equidigital number, since it uses as much as digits as its factorization.

72789131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 72789131 is about 8531.6546460813. The cubic root of 72789131 is about 417.5311146089.

It can be divided in two parts, 72789 and 131, that multiplied together give a palindrome (9535359).

The spelling of 72789131 in words is "seventy-two million, seven hundred eighty-nine thousand, one hundred thirty-one".