1971281183 has 2 divisors, whose sum is σ = 1971281184. Its totient is φ = 1971281182.

The previous prime is 1971281149. The next prime is 1971281201. The reversal of 1971281183 is 3811821791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1971281183 - 2¹⁶ = 1971215647 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1971281183.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971280183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985640591 + 985640592.

It is an arithmetic number, because the mean of its divisors is an integer number (985640592).

Almost surely, 2^1971281183 is an apocalyptic number.

1971281183 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971281183 is an equidigital number, since it uses as much as digits as its factorization.

1971281183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 1971281183 is about 44399.1124122994. The cubic root of 1971281183 is about 1253.8613785620.

The spelling of 1971281183 in words is "one billion, nine hundred seventy-one million, two hundred eighty-one thousand, one hundred eighty-three".