1581068997 has 16 divisors (see below), whose sum is σ = 2348974080. Its totient is φ = 1051053696.

The previous prime is 1581068981. The next prime is 1581069011. The reversal of 1581068997 is 7998601851.

It is not a de Polignac number, because 1581068997 - 2⁴ = 1581068981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581068927) 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 in 15 ways as a sum of consecutive naturals, for example, 73413 + ... + 92474.

It is an arithmetic number, because the mean of its divisors is an integer number (146810880).

Almost surely, 2^1581068997 is an apocalyptic number.

It is an amenable number.

1581068997 is a deficient number, since it is larger than the sum of its proper divisors (767905083).

1581068997 is a wasteful number, since it uses less digits than its factorization.

1581068997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166249 (or 166243 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The square root of 1581068997 is about 39762.6583241111. The cubic root of 1581068997 is about 1164.9758993461.

The spelling of 1581068997 in words is "one billion, five hundred eighty-one million, sixty-eight thousand, nine hundred ninety-seven".