42115551 has 8 divisors (see below), whose sum is σ = 56223024. Its totient is φ = 28042560.

The previous prime is 42115547. The next prime is 42115589. The reversal of 42115551 is 15551124.

42115551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42115551 - 2² = 42115547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42115501) 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 7 ways as a sum of consecutive naturals, for example, 5620 + ... + 10761.

It is an arithmetic number, because the mean of its divisors is an integer number (7027878).

Almost surely, 2^42115551 is an apocalyptic number.

42115551 is a deficient number, since it is larger than the sum of its proper divisors (14107473).

42115551 is a wasteful number, since it uses less digits than its factorization.

42115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17241.

The product of its digits is 1000, while the sum is 24.

The square root of 42115551 is about 6489.6495282873. The cubic root of 42115551 is about 347.9211490660.

Adding to 42115551 its reverse (15551124), we get a palindrome (57666675).

The spelling of 42115551 in words is "forty-two million, one hundred fifteen thousand, five hundred fifty-one".