491251419773 has 2 divisors, whose sum is σ = 491251419774. Its totient is φ = 491251419772.

The previous prime is 491251419709. The next prime is 491251419803. The reversal of 491251419773 is 377914152194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472536632569 + 18714787204 = 687413^2 + 136802^2 .

It is a cyclic number.

It is not a de Polignac number, because 491251419773 - 2⁶ = 491251419709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491251410773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245625709886 + 245625709887.

It is an arithmetic number, because the mean of its divisors is an integer number (245625709887).

Almost surely, 2^491251419773 is an apocalyptic number.

It is an amenable number.

491251419773 is a deficient number, since it is larger than the sum of its proper divisors (1).

491251419773 is an equidigital number, since it uses as much as digits as its factorization.

491251419773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The spelling of 491251419773 in words is "four hundred ninety-one billion, two hundred fifty-one million, four hundred nineteen thousand, seven hundred seventy-three".