72126191 has 2 divisors, whose sum is σ = 72126192. Its totient is φ = 72126190.

The previous prime is 72126169. The next prime is 72126199. The reversal of 72126191 is 19162127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72126191 - 2¹⁰ = 72125167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72126199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36063095 + 36063096.

It is an arithmetic number, because the mean of its divisors is an integer number (36063096).

Almost surely, 2^72126191 is an apocalyptic number.

72126191 is a deficient number, since it is larger than the sum of its proper divisors (1).

72126191 is an equidigital number, since it uses as much as digits as its factorization.

72126191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 72126191 is about 8492.7139949488. The cubic root of 72126191 is about 416.2596670704.

The spelling of 72126191 in words is "seventy-two million, one hundred twenty-six thousand, one hundred ninety-one".