1999997141 has 2 divisors, whose sum is σ = 1999997142. Its totient is φ = 1999997140.

The previous prime is 1999997117. The next prime is 1999997159. The reversal of 1999997141 is 1417999991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1985058916 + 14938225 = 44554^2 + 3865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999997141 - 2²⁶ = 1932888277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999997341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999998570 + 999998571.

It is an arithmetic number, because the mean of its divisors is an integer number (999998571).

Almost surely, 2^1999997141 is an apocalyptic number.

It is an amenable number.

1999997141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999997141 is an equidigital number, since it uses as much as digits as its factorization.

1999997141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 59.

The square root of 1999997141 is about 44721.3275853926. The cubic root of 1999997141 is about 1259.9204495422.

The spelling of 1999997141 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred forty-one".