609135881 has 4 divisors (see below), whose sum is σ = 609453264. Its totient is φ = 608818500.

The previous prime is 609135869. The next prime is 609135907. The reversal of 609135881 is 188531906.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188531906 = 2 ⋅94265953.

It is a cyclic number.

It is not a de Polignac number, because 609135881 - 2⁶ = 609135817 is a prime.

It is a super-2 number, since 2×609135881² = 742093043043292322, 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 (609135851) 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 3 ways as a sum of consecutive naturals, for example, 155795 + ... + 159656.

It is an arithmetic number, because the mean of its divisors is an integer number (152363316).

Almost surely, 2^609135881 is an apocalyptic number.

It is an amenable number.

609135881 is a deficient number, since it is larger than the sum of its proper divisors (317383).

609135881 is a wasteful number, since it uses less digits than its factorization.

609135881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317382.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 609135881 is about 24680.6782929481. The cubic root of 609135881 is about 847.6919535155.

It can be divided in two parts, 609135 and 881, that added together give a palindrome (610016).

The spelling of 609135881 in words is "six hundred nine million, one hundred thirty-five thousand, eight hundred eighty-one".