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131201 = 718743
BaseRepresentation
bin100000000010000001
320122222022
4200002001
513144301
62451225
71054340
oct400201
9218868
10131201
118a634
1263b15
1347945
1435b57
1528d1b
hex20081

131201 has 4 divisors (see below), whose sum is σ = 149952. Its totient is φ = 112452.

The previous prime is 131171. The next prime is 131203. The reversal of 131201 is 102131.

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 a de Polignac number, because none of the positive numbers 2k-131201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9365 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (37488).

2131201 is an apocalyptic number.

It is an amenable number.

131201 is a deficient number, since it is larger than the sum of its proper divisors (18751).

131201 is an equidigital number, since it uses as much as digits as its factorization.

131201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18750.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 131201 is about 362.2167859169. The cubic root of 131201 is about 50.8134928096.

Adding to 131201 its reverse (102131), we get a palindrome (233332).

The spelling of 131201 in words is "one hundred thirty-one thousand, two hundred one".

Divisors: 1 7 18743 131201