72345811 has 2 divisors, whose sum is σ = 72345812. Its totient is φ = 72345810.

The previous prime is 72345799. The next prime is 72345899. The reversal of 72345811 is 11854327.

It is a weak prime.

It is an emirp because it is prime and its reverse (11854327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72345811 - 2²³ = 63957203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72345011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36172905 + 36172906.

It is an arithmetic number, because the mean of its divisors is an integer number (36172906).

Almost surely, 2^72345811 is an apocalyptic number.

72345811 is a deficient number, since it is larger than the sum of its proper divisors (1).

72345811 is an equidigital number, since it uses as much as digits as its factorization.

72345811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 72345811 is about 8505.6340739536. The cubic root of 72345811 is about 416.6817343529.

The spelling of 72345811 in words is "seventy-two million, three hundred forty-five thousand, eight hundred eleven".