135987899 has 4 divisors (see below), whose sum is σ = 136021800. Its totient is φ = 135954000.

The previous prime is 135987871. The next prime is 135987919. The reversal of 135987899 is 998789531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998789531 = 2203 ⋅453377.

It is a cyclic number.

It is not a de Polignac number, because 135987899 - 2²⁴ = 119210683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135987829) 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, 9977 + ... + 19274.

It is an arithmetic number, because the mean of its divisors is an integer number (34005450).

Almost surely, 2^135987899 is an apocalyptic number.

135987899 is a deficient number, since it is larger than the sum of its proper divisors (33901).

135987899 is an equidigital number, since it uses as much as digits as its factorization.

135987899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33900.

The product of its digits is 4898880, while the sum is 59.

The square root of 135987899 is about 11661.3849520544. The cubic root of 135987899 is about 514.2410651898.

The spelling of 135987899 in words is "one hundred thirty-five million, nine hundred eighty-seven thousand, eight hundred ninety-nine".