981571 has 4 divisors (see below), whose sum is σ = 1024272. Its totient is φ = 938872.

The previous prime is 981569. The next prime is 981577. The reversal of 981571 is 175189.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 981571 - 2¹ = 981569 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21316 + ... + 21361.

It is an arithmetic number, because the mean of its divisors is an integer number (256068).

2⁹⁸¹⁵⁷¹ is an apocalyptic number.

981571 is a deficient number, since it is larger than the sum of its proper divisors (42701).

981571 is a wasteful number, since it uses less digits than its factorization.

981571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42700.

The product of its digits is 2520, while the sum is 31.

The square root of 981571 is about 990.7426507424. The cubic root of 981571 is about 99.3818872381.

The spelling of 981571 in words is "nine hundred eighty-one thousand, five hundred seventy-one".