491071879 has 2 divisors, whose sum is σ = 491071880. Its totient is φ = 491071878.

The previous prime is 491071859. The next prime is 491071901. The reversal of 491071879 is 978170194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491071879 - 2¹³ = 491063687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491071859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245535939 + 245535940.

It is an arithmetic number, because the mean of its divisors is an integer number (245535940).

Almost surely, 2^491071879 is an apocalyptic number.

491071879 is a deficient number, since it is larger than the sum of its proper divisors (1).

491071879 is an equidigital number, since it uses as much as digits as its factorization.

491071879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 491071879 is about 22160.1416737349. The cubic root of 491071879 is about 788.9479554847.

The spelling of 491071879 in words is "four hundred ninety-one million, seventy-one thousand, eight hundred seventy-nine".