136442261 has 4 divisors (see below), whose sum is σ = 137424000. Its totient is φ = 135460524.

The previous prime is 136442239. The next prime is 136442297. The reversal of 136442261 is 162244631.

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 a de Polignac number, because none of the positive numbers 2^k-136442261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136442461) 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, 490661 + ... + 490938.

It is an arithmetic number, because the mean of its divisors is an integer number (34356000).

Almost surely, 2^136442261 is an apocalyptic number.

It is an amenable number.

136442261 is a deficient number, since it is larger than the sum of its proper divisors (981739).

136442261 is an equidigital number, since it uses as much as digits as its factorization.

136442261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981738.

The product of its digits is 6912, while the sum is 29.

The square root of 136442261 is about 11680.8501830988. The cubic root of 136442261 is about 514.8131549551.

Adding to 136442261 its reverse (162244631), we get a palindrome (298686892).

The spelling of 136442261 in words is "one hundred thirty-six million, four hundred forty-two thousand, two hundred sixty-one".