35981 has 4 divisors (see below), whose sum is σ = 39264. Its totient is φ = 32700.

The previous prime is 35977. The next prime is 35983. The reversal of 35981 is 18953.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18953 = 11 ⋅1723.

It is a cyclic number.

It is not a de Polignac number, because 35981 - 2² = 35977 is a prime.

It is a super-2 number, since 2×35981² = 2589264722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 35981.

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 35981.

It is not an unprimeable number, because it can be changed into a prime (35983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (9816).

2³⁵⁹⁸¹ is an apocalyptic number.

It is an amenable number.

35981 is a deficient number, since it is larger than the sum of its proper divisors (3283).

35981 is a wasteful number, since it uses less digits than its factorization.

35981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282.

The product of its digits is 1080, while the sum is 26.

The square root of 35981 is about 189.6865836057. The cubic root of 35981 is about 33.0134625206.

The spelling of 35981 in words is "thirty-five thousand, nine hundred eighty-one".