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131620 = 2256581
BaseRepresentation
bin100000001000100100
320200112211
4200020210
513202440
62453204
71055506
oct401044
9220484
10131620
118a985
1264204
1347ba8
1435d76
1528eea
hex20224

131620 has 12 divisors (see below), whose sum is σ = 276444. Its totient is φ = 52640.

The previous prime is 131617. The next prime is 131627. The reversal of 131620 is 26131.

It can be written as a sum of positive squares in 2 ways, for example, as 39204 + 92416 = 198^2 + 304^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 131620.

It is not an unprimeable number, because it can be changed into a prime (131627) 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, 3271 + ... + 3310.

It is an arithmetic number, because the mean of its divisors is an integer number (23037).

2131620 is an apocalyptic number.

131620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131620 is an abundant number, since it is smaller than the sum of its proper divisors (144824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131620 is a wasteful number, since it uses less digits than its factorization.

131620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6590 (or 6588 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 131620 is about 362.7947077894. The cubic root of 131620 is about 50.8675275323.

Adding to 131620 its reverse (26131), we get a palindrome (157751).

The spelling of 131620 in words is "one hundred thirty-one thousand, six hundred twenty".

Divisors: 1 2 4 5 10 20 6581 13162 26324 32905 65810 131620