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BaseRepresentation
bin100000001010100101
320200201121
4200022211
513203444
62453541
71056052
oct401245
9220647
10131749
118aa92
12642b1
1347c77
1436029
1529084
hex202a5

131749 has 2 divisors, whose sum is σ = 131750. Its totient is φ = 131748.

The previous prime is 131743. The next prime is 131759. The reversal of 131749 is 947131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101124 + 30625 = 318^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 131749 - 215 = 98981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65874 + 65875.

It is an arithmetic number, because the mean of its divisors is an integer number (65875).

131749 is a Friedman number, since it can be written as 7+9*(11^4-3), using all its digits and the basic arithmetic operations.

2131749 is an apocalyptic number.

It is an amenable number.

131749 is a deficient number, since it is larger than the sum of its proper divisors (1).

131749 is an equidigital number, since it uses as much as digits as its factorization.

131749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 131749 is about 362.9724507452. The cubic root of 131749 is about 50.8841404292.

The spelling of 131749 in words is "one hundred thirty-one thousand, seven hundred forty-nine".