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201431 = 1571283
BaseRepresentation
bin110001001011010111
3101020022102
4301023113
522421211
64152315
71466156
oct611327
9336272
10201431
1112837a
129869b
13708b9
145359d
153ea3b
hex312d7

201431 has 4 divisors (see below), whose sum is σ = 202872. Its totient is φ = 199992.

The previous prime is 201413. The next prime is 201437. The reversal of 201431 is 134102.

It is a happy number.

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 201431 - 210 = 200407 is a prime.

It is a super-4 number, since 4×2014314 (a number of 22 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 201431.

It is not an unprimeable number, because it can be changed into a prime (201437) 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, 485 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (50718).

2201431 is an apocalyptic number.

201431 is a deficient number, since it is larger than the sum of its proper divisors (1441).

201431 is a wasteful number, since it uses less digits than its factorization.

201431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 201431 is about 448.8106504975. The cubic root of 201431 is about 58.6194990770.

Adding to 201431 its reverse (134102), we get a palindrome (335533).

The spelling of 201431 in words is "two hundred one thousand, four hundred thirty-one".

Divisors: 1 157 1283 201431