131501 has 2 divisors, whose sum is σ = 131502. Its totient is φ = 131500.

The previous prime is 131497. The next prime is 131507. The reversal of 131501 is 105131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126025 + 5476 = 355^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 131501 - 2² = 131497 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65750 + 65751.

It is an arithmetic number, because the mean of its divisors is an integer number (65751).

2¹³¹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

131501 is a deficient number, since it is larger than the sum of its proper divisors (1).

131501 is an equidigital number, since it uses as much as digits as its factorization.

131501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15, while the sum is 11.

The square root of 131501 is about 362.6306661053. The cubic root of 131501 is about 50.8521928289.

Adding to 131501 its reverse (105131), we get a palindrome (236632).

The spelling of 131501 in words is "one hundred thirty-one thousand, five hundred one".