1491491478119 has 2 divisors, whose sum is σ = 1491491478120. Its totient is φ = 1491491478118.

The previous prime is 1491491478097. The next prime is 1491491478143. The reversal of 1491491478119 is 9118741941941.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491491478119 is a prime.

It is a super-2 number, since 2×1491491478119² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491491474119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745745739059 + 745745739060.

It is an arithmetic number, because the mean of its divisors is an integer number (745745739060).

Almost surely, 2^{1491491478119} is an apocalyptic number.

1491491478119 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491491478119 is an equidigital number, since it uses as much as digits as its factorization.

1491491478119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 59.

The spelling of 1491491478119 in words is "one trillion, four hundred ninety-one billion, four hundred ninety-one million, four hundred seventy-eight thousand, one hundred nineteen".