42228251 has 4 divisors (see below), whose sum is σ = 45476592. Its totient is φ = 38979912.

The previous prime is 42228233. The next prime is 42228259. The reversal of 42228251 is 15282224.

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

It is a cyclic number.

It is not a de Polignac number, because 42228251 - 2¹⁸ = 41966107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42228251.

It is not an unprimeable number, because it can be changed into a prime (42228259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624151 + ... + 1624176.

It is an arithmetic number, because the mean of its divisors is an integer number (11369148).

Almost surely, 2^42228251 is an apocalyptic number.

42228251 is a deficient number, since it is larger than the sum of its proper divisors (3248341).

42228251 is a wasteful number, since it uses less digits than its factorization.

42228251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3248340.

The product of its digits is 2560, while the sum is 26.

The square root of 42228251 is about 6498.3267846423. The cubic root of 42228251 is about 348.2312149751.

The spelling of 42228251 in words is "forty-two million, two hundred twenty-eight thousand, two hundred fifty-one".