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193131 = 3323311
BaseRepresentation
bin101111001001101011
3100210221000
4233021223
522140011
64050043
71433031
oct571153
9323830
10193131
11122114
1293923
1369ba3
1450551
153c356
hex2f26b

193131 has 16 divisors (see below), whose sum is σ = 299520. Its totient is φ = 122760.

The previous prime is 193093. The next prime is 193133. The reversal of 193131 is 131391.

It can be divided in two parts, 193 and 131, that added together give a square (324 = 182).

193131 is a nontrivial binomial coefficient, being equal to C(622, 2).

It is not a de Polignac number, because 193131 - 27 = 193003 is a prime.

It is a super-2 number, since 2×1931312 = 74599166322, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193133) 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, 466 + ... + 776.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2193131 is an apocalyptic number.

193131 is the 621-st triangular number and also the 311-st hexagonal number.

193131 is a deficient number, since it is larger than the sum of its proper divisors (106389).

193131 is a wasteful number, since it uses less digits than its factorization.

193131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 337 counting only the distinct ones).

The product of its digits is 81, while the sum is 18.

The square root of 193131 is about 439.4667222896. The cubic root of 193131 is about 57.8030377989.

The spelling of 193131 in words is "one hundred ninety-three thousand, one hundred thirty-one".

Divisors: 1 3 9 23 27 69 207 311 621 933 2799 7153 8397 21459 64377 193131