981641 has 4 divisors (see below), whose sum is σ = 993552. Its totient is φ = 969732.

The previous prime is 981637. The next prime is 981653. The reversal of 981641 is 146189.

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.

It is a cyclic number.

It is not a de Polignac number, because 981641 - 2² = 981637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981601) 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, 5831 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (248388).

2⁹⁸¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

981641 is a deficient number, since it is larger than the sum of its proper divisors (11911).

981641 is a wasteful number, since it uses less digits than its factorization.

981641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11910.

The product of its digits is 1728, while the sum is 29.

The square root of 981641 is about 990.7779771473. Note that the first 3 decimals coincide. The cubic root of 981641 is about 99.3842496302.

The spelling of 981641 in words is "nine hundred eighty-one thousand, six hundred forty-one".