135261431 has 2 divisors, whose sum is σ = 135261432. Its totient is φ = 135261430.

The previous prime is 135261407. The next prime is 135261433. The reversal of 135261431 is 134162531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135261431 is a prime.

It is a super-2 number, since 2×135261431² = 36591309432335522, which contains 22 as substring.

Together with 135261433, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135261431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135261433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67630715 + 67630716.

It is an arithmetic number, because the mean of its divisors is an integer number (67630716).

Almost surely, 2^135261431 is an apocalyptic number.

135261431 is a deficient number, since it is larger than the sum of its proper divisors (1).

135261431 is an equidigital number, since it uses as much as digits as its factorization.

135261431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 135261431 is about 11630.1947963050. The cubic root of 135261431 is about 513.3237117535.

The spelling of 135261431 in words is "one hundred thirty-five million, two hundred sixty-one thousand, four hundred thirty-one".