1954193187719 has 2 divisors, whose sum is σ = 1954193187720. Its totient is φ = 1954193187718.

The previous prime is 1954193187697. The next prime is 1954193187733. The reversal of 1954193187719 is 9177813914591.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1954193187719 is a prime.

It is a super-2 number, since 2×1954193187719² (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 (1954193187119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977096593859 + 977096593860.

It is an arithmetic number, because the mean of its divisors is an integer number (977096593860).

Almost surely, 2^{1954193187719} is an apocalyptic number.

1954193187719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954193187719 is an equidigital number, since it uses as much as digits as its factorization.

1954193187719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17146080, while the sum is 65.

The spelling of 1954193187719 in words is "one trillion, nine hundred fifty-four billion, one hundred ninety-three million, one hundred eighty-seven thousand, seven hundred nineteen".