971999 has 8 divisors (see below), whose sum is σ = 1118208. Its totient is φ = 827640.

The previous prime is 971989. The next prime is 972001. The reversal of 971999 is 999179.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 971999 - 2¹² = 967903 is a prime.

971999 is a modest number, since divided by 999 gives 971 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (139776).

2⁹⁷¹⁹⁹⁹ is an apocalyptic number.

971999 is a deficient number, since it is larger than the sum of its proper divisors (146209).

971999 is a wasteful number, since it uses less digits than its factorization.

971999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925.

The product of its digits is 45927, while the sum is 44.

The square root of 971999 is about 985.9000963587. The cubic root of 971999 is about 99.0577834964.

The spelling of 971999 in words is "nine hundred seventy-one thousand, nine hundred ninety-nine".