981611 has 4 divisors (see below), whose sum is σ = 984312. Its totient is φ = 978912.

The previous prime is 981601. The next prime is 981623. The reversal of 981611 is 116189.

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 981611 - 2¹⁰ = 980587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981611.

It is not an unprimeable number, because it can be changed into a prime (981601) 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, 701 + ... + 1566.

It is an arithmetic number, because the mean of its divisors is an integer number (246078).

2⁹⁸¹⁶¹¹ is an apocalyptic number.

981611 is a deficient number, since it is larger than the sum of its proper divisors (2701).

981611 is a wasteful number, since it uses less digits than its factorization.

981611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700.

The product of its digits is 432, while the sum is 26.

The square root of 981611 is about 990.7628374137. The cubic root of 981611 is about 99.3832371902.

The spelling of 981611 in words is "nine hundred eighty-one thousand, six hundred eleven".