1981163519 has 2 divisors, whose sum is σ = 1981163520. Its totient is φ = 1981163518.

The previous prime is 1981163461. The next prime is 1981163533. The reversal of 1981163519 is 9153611891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1981163519 - 2⁸ = 1981163263 is a prime.

It is a super-2 number, since 2×1981163519² = 7850017778032926722, 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 1981163519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981163579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990581759 + 990581760.

It is an arithmetic number, because the mean of its divisors is an integer number (990581760).

Almost surely, 2^1981163519 is an apocalyptic number.

1981163519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981163519 is an equidigital number, since it uses as much as digits as its factorization.

1981163519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 44.

The square root of 1981163519 is about 44510.2630749359. The cubic root of 1981163519 is about 1255.9531536799.

The spelling of 1981163519 in words is "one billion, nine hundred eighty-one million, one hundred sixty-three thousand, five hundred nineteen".