42222551 has 4 divisors (see below), whose sum is σ = 48254352. Its totient is φ = 36190752.

The previous prime is 42222539. The next prime is 42222559. The reversal of 42222551 is 15522224.

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 42222551 - 2⁶ = 42222487 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 (42222559) 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, 3015890 + ... + 3015903.

It is an arithmetic number, because the mean of its divisors is an integer number (12063588).

Almost surely, 2^42222551 is an apocalyptic number.

42222551 is a deficient number, since it is larger than the sum of its proper divisors (6031801).

42222551 is an equidigital number, since it uses as much as digits as its factorization.

42222551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6031800.

The product of its digits is 1600, while the sum is 23.

The square root of 42222551 is about 6497.8881954063. Note that the first 3 decimals coincide. The cubic root of 42222551 is about 348.2155461026.

Adding to 42222551 its reverse (15522224), we get a palindrome (57744775).

The spelling of 42222551 in words is "forty-two million, two hundred twenty-two thousand, five hundred fifty-one".