42225451 has 4 divisors (see below), whose sum is σ = 42306712. Its totient is φ = 42144192.

The previous prime is 42225413. The next prime is 42225457. The reversal of 42225451 is 15452224.

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

It is a 6-Lehmer number, since φ(42225451) divides (42225451-1)⁶.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42225451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42225457) 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, 39846 + ... + 40891.

It is an arithmetic number, because the mean of its divisors is an integer number (10576678).

Almost surely, 2^42225451 is an apocalyptic number.

42225451 is a deficient number, since it is larger than the sum of its proper divisors (81261).

42225451 is an equidigital number, since it uses as much as digits as its factorization.

42225451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81260.

The product of its digits is 3200, while the sum is 25.

The square root of 42225451 is about 6498.1113409975. Note that the first 3 decimals coincide. The cubic root of 42225451 is about 348.2235181613.

Adding to 42225451 its reverse (15452224), we get a palindrome (57677675).

The spelling of 42225451 in words is "forty-two million, two hundred twenty-five thousand, four hundred fifty-one".