135131237 has 2 divisors, whose sum is σ = 135131238. Its totient is φ = 135131236.

The previous prime is 135131219. The next prime is 135131273. The reversal of 135131237 is 732131531.

Together with next prime (135131273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133425601 + 1705636 = 11551^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 135131237 - 2¹⁸ = 134869093 is a prime.

It is a super-3 number, since 3×135131237³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135131207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67565618 + 67565619.

It is an arithmetic number, because the mean of its divisors is an integer number (67565619).

Almost surely, 2^135131237 is an apocalyptic number.

It is an amenable number.

135131237 is a deficient number, since it is larger than the sum of its proper divisors (1).

135131237 is an equidigital number, since it uses as much as digits as its factorization.

135131237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 26.

The square root of 135131237 is about 11624.5962080409. The cubic root of 135131237 is about 513.1589613612.

Adding to 135131237 its reverse (732131531), we get a palindrome (867262768).

The spelling of 135131237 in words is "one hundred thirty-five million, one hundred thirty-one thousand, two hundred thirty-seven".