135761891 has 4 divisors (see below), whose sum is σ = 138063000. Its totient is φ = 133460784.

The previous prime is 135761887. The next prime is 135761903. The reversal of 135761891 is 198167531.

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

It is a cyclic number.

It is not a de Polignac number, because 135761891 - 2² = 135761887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135761851) 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, 1150466 + ... + 1150583.

It is an arithmetic number, because the mean of its divisors is an integer number (34515750).

Almost surely, 2^135761891 is an apocalyptic number.

135761891 is a deficient number, since it is larger than the sum of its proper divisors (2301109).

135761891 is an equidigital number, since it uses as much as digits as its factorization.

135761891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301108.

The product of its digits is 45360, while the sum is 41.

The square root of 135761891 is about 11651.6904782096. The cubic root of 135761891 is about 513.9560225714.

The spelling of 135761891 in words is "one hundred thirty-five million, seven hundred sixty-one thousand, eight hundred ninety-one".