1971019873 has 2 divisors, whose sum is σ = 1971019874. Its totient is φ = 1971019872.

The previous prime is 1971019847. The next prime is 1971019907. The reversal of 1971019873 is 3789101791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994582369 + 976437504 = 31537^2 + 31248^2 .

It is an emirp because it is prime and its reverse (3789101791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971019873 is a prime.

It is a super-2 number, since 2×1971019873² = 7769838679521872258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1971019823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985509936 + 985509937.

It is an arithmetic number, because the mean of its divisors is an integer number (985509937).

Almost surely, 2^1971019873 is an apocalyptic number.

It is an amenable number.

1971019873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971019873 is an equidigital number, since it uses as much as digits as its factorization.

1971019873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 46.

The square root of 1971019873 is about 44396.1695757641. The cubic root of 1971019873 is about 1253.8059728022.

The spelling of 1971019873 in words is "one billion, nine hundred seventy-one million, nineteen thousand, eight hundred seventy-three".