135431399 has 2 divisors, whose sum is σ = 135431400. Its totient is φ = 135431398.

The previous prime is 135431353. The next prime is 135431419. The reversal of 135431399 is 993134531.

It is a strong prime.

It is an emirp because it is prime and its reverse (993134531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135431399 is a prime.

It is a super-4 number, since 4×135431399⁴ (a number of 34 digits) contains 4444 as substring.

It is equal to p_7668506 and since 135431399 and 7668506 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 (135431099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67715699 + 67715700.

It is an arithmetic number, because the mean of its divisors is an integer number (67715700).

Almost surely, 2^135431399 is an apocalyptic number.

135431399 is a deficient number, since it is larger than the sum of its proper divisors (1).

135431399 is an equidigital number, since it uses as much as digits as its factorization.

135431399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 135431399 is about 11637.4996885070. The cubic root of 135431399 is about 513.5386340322.

The spelling of 135431399 in words is "one hundred thirty-five million, four hundred thirty-one thousand, three hundred ninety-nine".