980991 has 24 divisors (see below), whose sum is σ = 1607424. Its totient is φ = 592920.

The previous prime is 980963. The next prime is 980999. The reversal of 980991 is 199089.

It is not a de Polignac number, because 980991 - 2¹³ = 972799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (980999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2490 + ... + 2856.

It is an arithmetic number, because the mean of its divisors is an integer number (66976).

2⁹⁸⁰⁹⁹¹ is an apocalyptic number.

980991 is a deficient number, since it is larger than the sum of its proper divisors (626433).

980991 is a wasteful number, since it uses less digits than its factorization.

980991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 980991 is about 990.4498977737. The cubic root of 980991 is about 99.3623088100.

The spelling of 980991 in words is "nine hundred eighty thousand, nine hundred ninety-one".