42161647 has 4 divisors (see below), whose sum is σ = 45994536. Its totient is φ = 38328760.

The previous prime is 42161641. The next prime is 42161681. The reversal of 42161647 is 74616124.

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-42161647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42161641) 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, 1916428 + ... + 1916449.

It is an arithmetic number, because the mean of its divisors is an integer number (11498634).

Almost surely, 2^42161647 is an apocalyptic number.

42161647 is a deficient number, since it is larger than the sum of its proper divisors (3832889).

42161647 is a wasteful number, since it uses less digits than its factorization.

42161647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3832888.

The product of its digits is 8064, while the sum is 31.

The square root of 42161647 is about 6493.2000585228. The cubic root of 42161647 is about 348.0480374740.

The spelling of 42161647 in words is "forty-two million, one hundred sixty-one thousand, six hundred forty-seven".