136191881 has 8 divisors (see below), whose sum is σ = 155939904. Its totient is φ = 116516880.

The previous prime is 136191851. The next prime is 136191889. The reversal of 136191881 is 188191631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136191881 is a prime.

It is a super-2 number, since 2×136191881² = 37096456900636322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136191889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14195 + ... + 21768.

It is an arithmetic number, because the mean of its divisors is an integer number (19492488).

Almost surely, 2^136191881 is an apocalyptic number.

It is an amenable number.

136191881 is a deficient number, since it is larger than the sum of its proper divisors (19748023).

136191881 is an equidigital number, since it uses as much as digits as its factorization.

136191881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36511.

The product of its digits is 10368, while the sum is 38.

The square root of 136191881 is about 11670.1277199523. The cubic root of 136191881 is about 514.4980574599.

The spelling of 136191881 in words is "one hundred thirty-six million, one hundred ninety-one thousand, eight hundred eighty-one".