135870408919 has 4 divisors (see below), whose sum is σ = 155280467344. Its totient is φ = 116460350496.

The previous prime is 135870408899. The next prime is 135870408941. The reversal of 135870408919 is 919804078531.

It is a happy number.

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

It is not a de Polignac number, because 135870408919 - 2¹³ = 135870400727 is a prime.

It is a super-2 number, since 2×135870408919² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135870408919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135870408959) 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, 9705029202 + ... + 9705029215.

It is an arithmetic number, because the mean of its divisors is an integer number (38820116836).

Almost surely, 2^135870408919 is an apocalyptic number.

135870408919 is a deficient number, since it is larger than the sum of its proper divisors (19410058425).

135870408919 is an equidigital number, since it uses as much as digits as its factorization.

135870408919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19410058424.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 135870408919 in words is "one hundred thirty-five billion, eight hundred seventy million, four hundred eight thousand, nine hundred nineteen".