1981513486 has 8 divisors (see below), whose sum is σ = 2981828304. Its totient is φ = 987570720.

The previous prime is 1981513463. The next prime is 1981513519. The reversal of 1981513486 is 6843151891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1592235 + ... + 1593478.

It is an arithmetic number, because the mean of its divisors is an integer number (372728538).

Almost surely, 2^1981513486 is an apocalyptic number.

1981513486 is a deficient number, since it is larger than the sum of its proper divisors (1000314818).

1981513486 is a wasteful number, since it uses less digits than its factorization.

1981513486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186026.

The product of its digits is 207360, while the sum is 46.

The square root of 1981513486 is about 44514.1942081399. The cubic root of 1981513486 is about 1256.0271028642.

The spelling of 1981513486 in words is "one billion, nine hundred eighty-one million, five hundred thirteen thousand, four hundred eighty-six".