981655 has 4 divisors (see below), whose sum is σ = 1177992. Its totient is φ = 785320.

The previous prime is 981653. The next prime is 981683. The reversal of 981655 is 556189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556189 = 17 ⋅32717.

It is not a de Polignac number, because 981655 - 2¹ = 981653 is a prime.

It is a Duffinian number.

981655 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 981655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981653) 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, 98161 + ... + 98170.

It is an arithmetic number, because the mean of its divisors is an integer number (294498).

2⁹⁸¹⁶⁵⁵ is an apocalyptic number.

981655 is a deficient number, since it is larger than the sum of its proper divisors (196337).

981655 is a wasteful number, since it uses less digits than its factorization.

981655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196336.

The product of its digits is 10800, while the sum is 34.

The square root of 981655 is about 990.7850422771. The cubic root of 981655 is about 99.3847220951.

The spelling of 981655 in words is "nine hundred eighty-one thousand, six hundred fifty-five".