135262781 has 2 divisors, whose sum is σ = 135262782. Its totient is φ = 135262780.

The previous prime is 135262763. The next prime is 135262783. The reversal of 135262781 is 187262531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134676025 + 586756 = 11605^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 135262781 - 2¹⁸ = 135000637 is a prime.

It is a super-2 number, since 2×135262781² = 36592039847707922, which contains 22 as substring.

Together with 135262783, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7659530 and since 135262781 and 7659530 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135262783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67631390 + 67631391.

It is an arithmetic number, because the mean of its divisors is an integer number (67631391).

Almost surely, 2^135262781 is an apocalyptic number.

It is an amenable number.

135262781 is a deficient number, since it is larger than the sum of its proper divisors (1).

135262781 is an equidigital number, since it uses as much as digits as its factorization.

135262781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 135262781 is about 11630.2528347410. The cubic root of 135262781 is about 513.3254195197.

The spelling of 135262781 in words is "one hundred thirty-five million, two hundred sixty-two thousand, seven hundred eighty-one".