1981247170 has 32 divisors (see below), whose sum is σ = 4077570816. Its totient is φ = 678974400.

The previous prime is 1981247153. The next prime is 1981247183. The reversal of 1981247170 is 717421891.

It is a super-3 number, since 3×1981247170³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 190300 + ... + 200440.

It is an arithmetic number, because the mean of its divisors is an integer number (127424088).

Almost surely, 2^1981247170 is an apocalyptic number.

1981247170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981247170 is an abundant number, since it is smaller than the sum of its proper divisors (2096323646).

1981247170 is a wasteful number, since it uses less digits than its factorization.

1981247170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12946.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1981247170 is about 44511.2027471737. The cubic root of 1981247170 is about 1255.9708302048.

The spelling of 1981247170 in words is "one billion, nine hundred eighty-one million, two hundred forty-seven thousand, one hundred seventy".