1919018199431 has 2 divisors, whose sum is σ = 1919018199432. Its totient is φ = 1919018199430.

The previous prime is 1919018199407. The next prime is 1919018199529. The reversal of 1919018199431 is 1349918109191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1919018199431 - 2²² = 1919014005127 is a prime.

It is a super-2 number, since 2×1919018199431² (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 (1919018099431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959509099715 + 959509099716.

It is an arithmetic number, because the mean of its divisors is an integer number (959509099716).

Almost surely, 2^{1919018199431} is an apocalyptic number.

1919018199431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919018199431 is an equidigital number, since it uses as much as digits as its factorization.

1919018199431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 56.

The spelling of 1919018199431 in words is "one trillion, nine hundred nineteen billion, eighteen million, one hundred ninety-nine thousand, four hundred thirty-one".