72911131 has 2 divisors, whose sum is σ = 72911132. Its totient is φ = 72911130.

The previous prime is 72911123. The next prime is 72911177. The reversal of 72911131 is 13111927.

It is a weak prime.

It is an emirp because it is prime and its reverse (13111927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72911131 - 2³ = 72911123 is a prime.

It is a super-2 number, since 2×72911131² = 10632066047398322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72911096 and 72911105.

It is not a weakly prime, because it can be changed into another prime (72911231) 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, 36455565 + 36455566.

It is an arithmetic number, because the mean of its divisors is an integer number (36455566).

Almost surely, 2^72911131 is an apocalyptic number.

72911131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72911131 is an equidigital number, since it uses as much as digits as its factorization.

72911131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 25.

The square root of 72911131 is about 8538.8014966973. The cubic root of 72911131 is about 417.7642554762.

The spelling of 72911131 in words is "seventy-two million, nine hundred eleven thousand, one hundred thirty-one".