1981529886 has 16 divisors (see below), whose sum is σ = 4529211264. Its totient is φ = 566151384.

The previous prime is 1981529873. The next prime is 1981529941. The reversal of 1981529886 is 6889251891.

It is a super-2 number, since 2×1981529886² = 7852921378222345992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23589600 + ... + 23589683.

It is an arithmetic number, because the mean of its divisors is an integer number (283075704).

Almost surely, 2^1981529886 is an apocalyptic number.

1981529886 is an abundant number, since it is smaller than the sum of its proper divisors (2547681378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981529886 is a wasteful number, since it uses less digits than its factorization.

1981529886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47179295.

The product of its digits is 2488320, while the sum is 57.

The square root of 1981529886 is about 44514.3784186638. The cubic root of 1981529886 is about 1256.0305680249.

The spelling of 1981529886 in words is "one billion, nine hundred eighty-one million, five hundred twenty-nine thousand, eight hundred eighty-six".