42136691 has 4 divisors (see below), whose sum is σ = 42250032. Its totient is φ = 42023352.

The previous prime is 42136663. The next prime is 42136697. The reversal of 42136691 is 19663124.

42136691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42136691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42136697) 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, 56111 + ... + 56856.

It is an arithmetic number, because the mean of its divisors is an integer number (10562508).

Almost surely, 2^42136691 is an apocalyptic number.

42136691 is a deficient number, since it is larger than the sum of its proper divisors (113341).

42136691 is a wasteful number, since it uses less digits than its factorization.

42136691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113340.

The product of its digits is 7776, while the sum is 32.

The square root of 42136691 is about 6491.2780713816. The cubic root of 42136691 is about 347.9793526086.

The spelling of 42136691 in words is "forty-two million, one hundred thirty-six thousand, six hundred ninety-one".