136139869 has 4 divisors (see below), whose sum is σ = 136178496. Its totient is φ = 136101244.

The previous prime is 136139867. The next prime is 136139911. The reversal of 136139869 is 968931631.

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 136139869 - 2¹ = 136139867 is a prime.

It is a super-2 number, since 2×136139869² = 37068127862674322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136139863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13429 + ... + 21274.

It is an arithmetic number, because the mean of its divisors is an integer number (34044624).

Almost surely, 2^136139869 is an apocalyptic number.

It is an amenable number.

136139869 is a deficient number, since it is larger than the sum of its proper divisors (38627).

136139869 is an equidigital number, since it uses as much as digits as its factorization.

136139869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38626.

The product of its digits is 209952, while the sum is 46.

The square root of 136139869 is about 11667.8990825255. The cubic root of 136139869 is about 514.4325531140.

The spelling of 136139869 in words is "one hundred thirty-six million, one hundred thirty-nine thousand, eight hundred sixty-nine".