136894881 has 4 divisors (see below), whose sum is σ = 182526512. Its totient is φ = 91263252.

The previous prime is 136894871. The next prime is 136894883. The reversal of 136894881 is 188498631.

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 not a de Polignac number, because 136894881 - 2¹³ = 136886689 is a prime.

It is a super-2 number, since 2×136894881² = 37480416888008322, which contains 22 as substring.

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 136894881.

It is not an unprimeable number, because it can be changed into a prime (136894883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22815811 + ... + 22815816.

It is an arithmetic number, because the mean of its divisors is an integer number (45631628).

Almost surely, 2^136894881 is an apocalyptic number.

It is an amenable number.

136894881 is a deficient number, since it is larger than the sum of its proper divisors (45631631).

136894881 is an equidigital number, since it uses as much as digits as its factorization.

136894881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45631630.

The product of its digits is 331776, while the sum is 48.

The square root of 136894881 is about 11700.2085878842. The cubic root of 136894881 is about 515.3817899766.

The spelling of 136894881 in words is "one hundred thirty-six million, eight hundred ninety-four thousand, eight hundred eighty-one".