42106651 has 4 divisors (see below), whose sum is σ = 42125400. Its totient is φ = 42087904.

The previous prime is 42106613. The next prime is 42106657. The reversal of 42106651 is 15660124.

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-42106651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42106657) 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, 5461 + ... + 10678.

It is an arithmetic number, because the mean of its divisors is an integer number (10531350).

Almost surely, 2^42106651 is an apocalyptic number.

42106651 is a deficient number, since it is larger than the sum of its proper divisors (18749).

42106651 is a wasteful number, since it uses less digits than its factorization.

42106651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18748.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42106651 is about 6488.9637847656. The cubic root of 42106651 is about 347.8966393833.

Adding to 42106651 its reverse (15660124), we get a palindrome (57766775).

The spelling of 42106651 in words is "forty-two million, one hundred six thousand, six hundred fifty-one".