102981 has 4 divisors (see below), whose sum is σ = 137312. Its totient is φ = 68652.

The previous prime is 102967. The next prime is 102983. The reversal of 102981 is 189201.

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: 189201 = 3 ⋅63067.

It is not a de Polignac number, because 102981 - 2¹⁰ = 101957 is a prime.

It is a super-2 number, since 2×102981² = 21210172722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon 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 102981.

It is not an unprimeable number, because it can be changed into a prime (102983) 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, 17161 + ... + 17166.

It is an arithmetic number, because the mean of its divisors is an integer number (34328).

2¹⁰²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

102981 is a deficient number, since it is larger than the sum of its proper divisors (34331).

102981 is an equidigital number, since it uses as much as digits as its factorization.

102981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34330.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 102981 is about 320.9065284471. The cubic root of 102981 is about 46.8725989881.

The spelling of 102981 in words is "one hundred two thousand, nine hundred eighty-one".