136245881 has 4 divisors (see below), whose sum is σ = 138816612. Its totient is φ = 133675152.

The previous prime is 136245853. The next prime is 136245919. The reversal of 136245881 is 188542631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103938025 + 32307856 = 10195^2 + 5684^2 .

It is a cyclic number.

It is not a de Polignac number, because 136245881 - 2⁶ = 136245817 is a prime.

It is a super-2 number, since 2×136245881² = 37125880178932322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136245821) 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, 1285286 + ... + 1285391.

It is an arithmetic number, because the mean of its divisors is an integer number (34704153).

Almost surely, 2^136245881 is an apocalyptic number.

It is an amenable number.

136245881 is a deficient number, since it is larger than the sum of its proper divisors (2570731).

136245881 is an equidigital number, since it uses as much as digits as its factorization.

136245881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570730.

The product of its digits is 46080, while the sum is 38.

The square root of 136245881 is about 11672.4410900205. The cubic root of 136245881 is about 514.5660478661.

The spelling of 136245881 in words is "one hundred thirty-six million, two hundred forty-five thousand, eight hundred eighty-one".