136371509 has 4 divisors (see below), whose sum is σ = 136413504. Its totient is φ = 136329516.

The previous prime is 136371481. The next prime is 136371527. The reversal of 136371509 is 905173631.

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.

It is a cyclic number.

It is not a de Polignac number, because 136371509 - 2¹⁶ = 136305973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136371559) 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, 15677 + ... + 22770.

It is an arithmetic number, because the mean of its divisors is an integer number (34103376).

Almost surely, 2^136371509 is an apocalyptic number.

It is an amenable number.

136371509 is a deficient number, since it is larger than the sum of its proper divisors (41995).

136371509 is an equidigital number, since it uses as much as digits as its factorization.

136371509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41994.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 136371509 is about 11677.8212437081. The cubic root of 136371509 is about 514.7241542849.

The spelling of 136371509 in words is "one hundred thirty-six million, three hundred seventy-one thousand, five hundred nine".