981191560 has 16 divisors (see below), whose sum is σ = 2207681100. Its totient is φ = 392476608.

The previous prime is 981191557. The next prime is 981191579. The reversal of 981191560 is 65191189.

It can be written as a sum of positive squares in 2 ways, for example, as 978813796 + 2377764 = 31286^2 + 1542^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 24529789 = 981191560 / (9 + 8 + 1 + 1 + 9 + 1 + 5 + 6 + 0).

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 3 ways as a sum of consecutive naturals, for example, 12264855 + ... + 12264934.

Almost surely, 2^981191560 is an apocalyptic number.

It is an amenable number.

981191560 is an abundant number, since it is smaller than the sum of its proper divisors (1226489540).

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

981191560 is a wasteful number, since it uses less digits than its factorization.

981191560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24529800 (or 24529796 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 40.

The square root of 981191560 is about 31323.9773975145. The cubic root of 981191560 is about 993.6907976809.

The spelling of 981191560 in words is "nine hundred eighty-one million, one hundred ninety-one thousand, five hundred sixty".