135816186431 has 4 divisors (see below), whose sum is σ = 137062206600. Its totient is φ = 134570166264.

The previous prime is 135816186419. The next prime is 135816186437. The reversal of 135816186431 is 134681618531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134681618531 = 1231 ⋅109408301.

It is a cyclic number.

It is not a de Polignac number, because 135816186431 - 2⁶ = 135816186367 is a prime.

It is a super-2 number, since 2×135816186431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135816186437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623009921 + ... + 623010138.

It is an arithmetic number, because the mean of its divisors is an integer number (34265551650).

Almost surely, 2^135816186431 is an apocalyptic number.

135816186431 is a deficient number, since it is larger than the sum of its proper divisors (1246020169).

135816186431 is a wasteful number, since it uses less digits than its factorization.

135816186431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246020168.

The product of its digits is 414720, while the sum is 47.

The spelling of 135816186431 in words is "one hundred thirty-five billion, eight hundred sixteen million, one hundred eighty-six thousand, four hundred thirty-one".