136357309 has 4 divisors (see below), whose sum is σ = 148753440. Its totient is φ = 123961180.

The previous prime is 136357307. The next prime is 136357327. The reversal of 136357309 is 903753631.

It is a happy number.

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: 903753631 = 11 ⋅82159421.

It is a cyclic number.

It is not a de Polignac number, because 136357309 - 2¹ = 136357307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136357301) 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, 6198049 + ... + 6198070.

It is an arithmetic number, because the mean of its divisors is an integer number (37188360).

Almost surely, 2^136357309 is an apocalyptic number.

It is an amenable number.

136357309 is a deficient number, since it is larger than the sum of its proper divisors (12396131).

136357309 is a wasteful number, since it uses less digits than its factorization.

136357309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12396130.

The product of its (nonzero) digits is 51030, while the sum is 37.

The square root of 136357309 is about 11677.2132377550. The cubic root of 136357309 is about 514.7062880489.

The spelling of 136357309 in words is "one hundred thirty-six million, three hundred fifty-seven thousand, three hundred nine".