72340091 has 2 divisors, whose sum is σ = 72340092. Its totient is φ = 72340090.

The previous prime is 72340057. The next prime is 72340111. The reversal of 72340091 is 19004327.

It is a strong prime.

It is an emirp because it is prime and its reverse (19004327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72340091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72340091.

It is not a weakly prime, because it can be changed into another prime (72340691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36170045 + 36170046.

It is an arithmetic number, because the mean of its divisors is an integer number (36170046).

Almost surely, 2^72340091 is an apocalyptic number.

72340091 is a deficient number, since it is larger than the sum of its proper divisors (1).

72340091 is an equidigital number, since it uses as much as digits as its factorization.

72340091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72340091 is about 8505.2978195946. The cubic root of 72340091 is about 416.6707524577.

The spelling of 72340091 in words is "seventy-two million, three hundred forty thousand, ninety-one".