981649 has 4 divisors (see below), whose sum is σ = 983664. Its totient is φ = 979636.

The previous prime is 981637. The next prime is 981653. The reversal of 981649 is 946189.

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: 946189 = 223 ⋅4243.

It is a cyclic number.

It is not a de Polignac number, because 981649 - 2⁹ = 981137 is a prime.

It is a Duffinian number.

981649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (981049) 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, 234 + ... + 1420.

It is an arithmetic number, because the mean of its divisors is an integer number (245916).

2⁹⁸¹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

981649 is a deficient number, since it is larger than the sum of its proper divisors (2015).

981649 is a wasteful number, since it uses less digits than its factorization.

981649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014.

The product of its digits is 15552, while the sum is 37.

The square root of 981649 is about 990.7820143705. The cubic root of 981649 is about 99.3845196107.

The spelling of 981649 in words is "nine hundred eighty-one thousand, six hundred forty-nine".