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321997 = 13173147
BaseRepresentation
bin1001110100111001101
3121100200211
41032213031
540300442
610522421
72510524
oct1164715
9540624
10321997
111aaa15
12136411
13b3740
14854bb
1565617
hex4e9cd

321997 has 16 divisors (see below), whose sum is σ = 387072. Its totient is φ = 264960.

The previous prime is 321991. The next prime is 322001. The reversal of 321997 is 799123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-321997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

321997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6828 + ... + 6874.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2321997 is an apocalyptic number.

It is an amenable number.

321997 is a deficient number, since it is larger than the sum of its proper divisors (65075).

321997 is a wasteful number, since it uses less digits than its factorization.

321997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108.

The product of its digits is 3402, while the sum is 31.

The square root of 321997 is about 567.4477949556. The cubic root of 321997 is about 68.5410271567.

The spelling of 321997 in words is "three hundred twenty-one thousand, nine hundred ninety-seven".

Divisors: 1 13 17 31 47 221 403 527 611 799 1457 6851 10387 18941 24769 321997