135869819 has 4 divisors (see below), whose sum is σ = 135921096. Its totient is φ = 135818544.

The previous prime is 135869759. The next prime is 135869821. The reversal of 135869819 is 918968531.

It is a happy number.

135869819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135869819 is a prime.

It is a super-2 number, since 2×135869819² = 36921215430185522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135869849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21434 + ... + 27039.

It is an arithmetic number, because the mean of its divisors is an integer number (33980274).

Almost surely, 2^135869819 is an apocalyptic number.

135869819 is a deficient number, since it is larger than the sum of its proper divisors (51277).

135869819 is an equidigital number, since it uses as much as digits as its factorization.

135869819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51276.

The product of its digits is 466560, while the sum is 50.

The square root of 135869819 is about 11656.3209890600. The cubic root of 135869819 is about 514.0921814312.

The spelling of 135869819 in words is "one hundred thirty-five million, eight hundred sixty-nine thousand, eight hundred nineteen".