136239089 has 4 divisors (see below), whose sum is σ = 155701824. Its totient is φ = 116776356.

The previous prime is 136239067. The next prime is 136239091. The reversal of 136239089 is 980932631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 980932631 = 7 ⋅140133233.

It is a cyclic number.

It is not a de Polignac number, because 136239089 - 2²⁰ = 135190513 is a prime.

It is a super-2 number, since 2×136239089² = 37122178743099842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136239029) 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, 9731357 + ... + 9731370.

It is an arithmetic number, because the mean of its divisors is an integer number (38925456).

Almost surely, 2^136239089 is an apocalyptic number.

It is an amenable number.

136239089 is a deficient number, since it is larger than the sum of its proper divisors (19462735).

136239089 is an equidigital number, since it uses as much as digits as its factorization.

136239089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19462734.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 136239089 is about 11672.1501446820. The cubic root of 136239089 is about 514.5574971717.

The spelling of 136239089 in words is "one hundred thirty-six million, two hundred thirty-nine thousand, eighty-nine".