136642891 has 8 divisors (see below), whose sum is σ = 170360064. Its totient is φ = 106474920.

The previous prime is 136642861. The next prime is 136642897. The reversal of 136642891 is 198246631.

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

It is a cyclic number.

It is not a de Polignac number, because 136642891 - 2⁵ = 136642859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136642897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887215 + ... + 887368.

It is an arithmetic number, because the mean of its divisors is an integer number (21295008).

Almost surely, 2^136642891 is an apocalyptic number.

136642891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136642891 is a deficient number, since it is larger than the sum of its proper divisors (33717173).

136642891 is a wasteful number, since it uses less digits than its factorization.

136642891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774601.

The product of its digits is 62208, while the sum is 40.

The square root of 136642891 is about 11689.4350162871. The cubic root of 136642891 is about 515.0653651284.

The spelling of 136642891 in words is "one hundred thirty-six million, six hundred forty-two thousand, eight hundred ninety-one".