1981058775 has 12 divisors (see below), whose sum is σ = 3275350632. Its totient is φ = 1056564640.

The previous prime is 1981058767. The next prime is 1981058777. The reversal of 1981058775 is 5778501891.

It is not a de Polignac number, because 1981058775 - 2³ = 1981058767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981058777) 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 11 ways as a sum of consecutive naturals, for example, 13206984 + ... + 13207133.

It is an arithmetic number, because the mean of its divisors is an integer number (272945886).

Almost surely, 2^1981058775 is an apocalyptic number.

1981058775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981058775 is a deficient number, since it is larger than the sum of its proper divisors (1294291857).

1981058775 is a wasteful number, since it uses less digits than its factorization.

1981058775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26414130 (or 26414125 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 51.

The square root of 1981058775 is about 44509.0864318737. The cubic root of 1981058775 is about 1255.9310192331.

The spelling of 1981058775 in words is "one billion, nine hundred eighty-one million, fifty-eight thousand, seven hundred seventy-five".