449791197991 has 2 divisors, whose sum is σ = 449791197992. Its totient is φ = 449791197990.

The previous prime is 449791197941. The next prime is 449791198009. The reversal of 449791197991 is 199791197944.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 449791197991 - 2¹⁷ = 449791066919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 449791197991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (449791197901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224895598995 + 224895598996.

It is an arithmetic number, because the mean of its divisors is an integer number (224895598996).

Almost surely, 2^449791197991 is an apocalyptic number.

449791197991 is a deficient number, since it is larger than the sum of its proper divisors (1).

449791197991 is an equidigital number, since it uses as much as digits as its factorization.

449791197991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46294416, while the sum is 70.

The spelling of 449791197991 in words is "four hundred forty-nine billion, seven hundred ninety-one million, one hundred ninety-seven thousand, nine hundred ninety-one".