1971308081 has 16 divisors (see below), whose sum is σ = 2084849280. Its totient is φ = 1860186240.

The previous prime is 1971308071. The next prime is 1971308107. The reversal of 1971308081 is 1808031791.

It is a cyclic number.

It is not a de Polignac number, because 1971308081 - 2¹⁴ = 1971291697 is a prime.

It is a super-2 number, since 2×1971308081² = 7772111100431805122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971308051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1254026 + ... + 1255596.

It is an arithmetic number, because the mean of its divisors is an integer number (130303080).

Almost surely, 2^1971308081 is an apocalyptic number.

It is an amenable number.

1971308081 is a deficient number, since it is larger than the sum of its proper divisors (113541199).

1971308081 is a wasteful number, since it uses less digits than its factorization.

1971308081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 1971308081 is about 44399.4153227269. The cubic root of 1971308081 is about 1253.8670814876.

The spelling of 1971308081 in words is "one billion, nine hundred seventy-one million, three hundred eight thousand, eighty-one".