1491291719 has 2 divisors, whose sum is σ = 1491291720. Its totient is φ = 1491291718.

The previous prime is 1491291713. The next prime is 1491291749. The reversal of 1491291719 is 9171921941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491291719 - 2²⁸ = 1222856263 is a prime.

It is a super-2 number, since 2×1491291719² = 4447901982315949922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1491291719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491291713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745645859 + 745645860.

It is an arithmetic number, because the mean of its divisors is an integer number (745645860).

Almost surely, 2^1491291719 is an apocalyptic number.

1491291719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491291719 is an equidigital number, since it uses as much as digits as its factorization.

1491291719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 44.

The square root of 1491291719 is about 38617.2463932891. The cubic root of 1491291719 is about 1142.4947211059.

The spelling of 1491291719 in words is "one billion, four hundred ninety-one million, two hundred ninety-one thousand, seven hundred nineteen".