571212491 has 2 divisors, whose sum is σ = 571212492. Its totient is φ = 571212490.

The previous prime is 571212457. The next prime is 571212547. The reversal of 571212491 is 194212175.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-571212491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (571212991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285606245 + 285606246.

It is an arithmetic number, because the mean of its divisors is an integer number (285606246).

Almost surely, 2^571212491 is an apocalyptic number.

571212491 is a deficient number, since it is larger than the sum of its proper divisors (1).

571212491 is an equidigital number, since it uses as much as digits as its factorization.

571212491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 571212491 is about 23900.0521129139. The cubic root of 571212491 is about 829.7219231034.

The spelling of 571212491 in words is "five hundred seventy-one million, two hundred twelve thousand, four hundred ninety-one".