136906291 has 4 divisors (see below), whose sum is σ = 137393784. Its totient is φ = 136418800.

The previous prime is 136906283. The next prime is 136906331. The reversal of 136906291 is 192609631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192609631 = 19 ⋅10137349.

It is a cyclic number.

It is not a de Polignac number, because 136906291 - 2³ = 136906283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136906291.

It is not an unprimeable number, because it can be changed into a prime (136906201) 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, 243325 + ... + 243886.

It is an arithmetic number, because the mean of its divisors is an integer number (34348446).

Almost surely, 2^136906291 is an apocalyptic number.

136906291 is a deficient number, since it is larger than the sum of its proper divisors (487493).

136906291 is an equidigital number, since it uses as much as digits as its factorization.

136906291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487492.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 136906291 is about 11700.6961758692. The cubic root of 136906291 is about 515.3961083665.

The spelling of 136906291 in words is "one hundred thirty-six million, nine hundred six thousand, two hundred ninety-one".