998971 has 4 divisors (see below), whose sum is σ = 1057752. Its totient is φ = 940192.

The previous prime is 998969. The next prime is 998983. The reversal of 998971 is 179899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998971 - 2¹ = 998969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998941) 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, 29365 + ... + 29398.

It is an arithmetic number, because the mean of its divisors is an integer number (264438).

2⁹⁹⁸⁹⁷¹ is an apocalyptic number.

998971 is a deficient number, since it is larger than the sum of its proper divisors (58781).

998971 is a wasteful number, since it uses less digits than its factorization.

998971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58780.

The product of its digits is 40824, while the sum is 43.

The square root of 998971 is about 999.4853675767. The cubic root of 998971 is about 99.9656882284.

The spelling of 998971 in words is "nine hundred ninety-eight thousand, nine hundred seventy-one".