136629409 has 4 divisors (see below), whose sum is σ = 156147904. Its totient is φ = 117110916.

The previous prime is 136629401. The next prime is 136629421. The reversal of 136629409 is 904926631.

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: 904926631 = 7 ⋅129275233.

It is a cyclic number.

It is not a de Polignac number, because 136629409 - 2³ = 136629401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136629401) 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, 9759237 + ... + 9759250.

It is an arithmetic number, because the mean of its divisors is an integer number (39036976).

Almost surely, 2^136629409 is an apocalyptic number.

It is an amenable number.

136629409 is a deficient number, since it is larger than the sum of its proper divisors (19518495).

136629409 is an equidigital number, since it uses as much as digits as its factorization.

136629409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19518494.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 136629409 is about 11688.8583274843. The cubic root of 136629409 is about 515.0484247676.

The spelling of 136629409 in words is "one hundred thirty-six million, six hundred twenty-nine thousand, four hundred nine".