1981569170 has 32 divisors (see below), whose sum is σ = 4080181248. Its totient is φ = 678760128.

The previous prime is 1981569167. The next prime is 1981569193. The reversal of 1981569170 is 719651891.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65519 + ... + 90861.

It is an arithmetic number, because the mean of its divisors is an integer number (127505664).

Almost surely, 2^1981569170 is an apocalyptic number.

1981569170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981569170 is an abundant number, since it is smaller than the sum of its proper divisors (2098612078).

1981569170 is a wasteful number, since it uses less digits than its factorization.

1981569170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26474.

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1981569170 is about 44514.8196671625. The cubic root of 1981569170 is about 1256.0388682746.

The spelling of 1981569170 in words is "one billion, nine hundred eighty-one million, five hundred sixty-nine thousand, one hundred seventy".