981131 has 4 divisors (see below), whose sum is σ = 1003992. Its totient is φ = 958272.

The previous prime is 981091. The next prime is 981133. The reversal of 981131 is 131189.

981131 = T₁₀₆ + T₁₀₇ + ... + T₁₉₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131189 = 17 ⋅7717.

It is a cyclic number.

It is not a de Polignac number, because 981131 - 2⁶ = 981067 is a prime.

It is a super-3 number, since 3×981131³ = 2833363198140213273, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981097 and 981106.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981131.

It is not an unprimeable number, because it can be changed into a prime (981133) 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, 11366 + ... + 11451.

It is an arithmetic number, because the mean of its divisors is an integer number (250998).

2⁹⁸¹¹³¹ is an apocalyptic number.

981131 is a deficient number, since it is larger than the sum of its proper divisors (22861).

981131 is a wasteful number, since it uses less digits than its factorization.

981131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22860.

The product of its digits is 216, while the sum is 23.

The square root of 981131 is about 990.5205702054. The cubic root of 981131 is about 99.3670353439.

The spelling of 981131 in words is "nine hundred eighty-one thousand, one hundred thirty-one".