164981 has 4 divisors (see below), whose sum is σ = 170700. Its totient is φ = 159264.
The previous prime is 164963. The next prime is 164987. The reversal of 164981 is 189461.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189461 = 41 ⋅4621.
It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 36100 = 359^2 + 190^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-164981 is a prime.
It is a super-2 number, since 2×1649812 = 54437460722, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 5689 = 164981 / (1 + 6 + 4 + 9 + 8 + 1).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (164987) 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, 2816 + ... + 2873.
It is an arithmetic number, because the mean of its divisors is an integer number (42675).
2164981 is an apocalyptic number.
It is an amenable number.
164981 is a deficient number, since it is larger than the sum of its proper divisors (5719).
164981 is an equidigital number, since it uses as much as digits as its factorization.
164981 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5718.
The product of its digits is 1728, while the sum is 29.
The square root of 164981 is about 406.1785321752. The cubic root of 164981 is about 54.8459601642.
The spelling of 164981 in words is "one hundred sixty-four thousand, nine hundred eighty-one".
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