72101291 has 2 divisors, whose sum is σ = 72101292. Its totient is φ = 72101290.

The previous prime is 72101287. The next prime is 72101311. The reversal of 72101291 is 19210127.

It is a weak prime.

It is an emirp because it is prime and its reverse (19210127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72101291 - 2² = 72101287 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72101261) 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, 36050645 + 36050646.

It is an arithmetic number, because the mean of its divisors is an integer number (36050646).

Almost surely, 2^72101291 is an apocalyptic number.

72101291 is a deficient number, since it is larger than the sum of its proper divisors (1).

72101291 is an equidigital number, since it uses as much as digits as its factorization.

72101291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 72101291 is about 8491.2479059323. The cubic root of 72101291 is about 416.2117600224.

The spelling of 72101291 in words is "seventy-two million, one hundred one thousand, two hundred ninety-one".