136869729 has 4 divisors (see below), whose sum is σ = 182492976. Its totient is φ = 91246484.

The previous prime is 136869701. The next prime is 136869751. The reversal of 136869729 is 927968631.

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: 927968631 = 3 ⋅309322877.

It is a cyclic number.

It is not a de Polignac number, because 136869729 - 2¹⁶ = 136804193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136869769) 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, 22811619 + ... + 22811624.

It is an arithmetic number, because the mean of its divisors is an integer number (45623244).

Almost surely, 2^136869729 is an apocalyptic number.

It is an amenable number.

136869729 is a deficient number, since it is larger than the sum of its proper divisors (45623247).

136869729 is an equidigital number, since it uses as much as digits as its factorization.

136869729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45623246.

The product of its digits is 979776, while the sum is 51.

The square root of 136869729 is about 11699.1336858761. The cubic root of 136869729 is about 515.3502239636.

The spelling of 136869729 in words is "one hundred thirty-six million, eight hundred sixty-nine thousand, seven hundred twenty-nine".