42126451 has 4 divisors (see below), whose sum is σ = 42755272. Its totient is φ = 41497632.

The previous prime is 42126449. The next prime is 42126457. The reversal of 42126451 is 15462124.

It is a happy number.

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 42126451 - 2¹ = 42126449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42126457) 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, 314310 + ... + 314443.

It is an arithmetic number, because the mean of its divisors is an integer number (10688818).

Almost surely, 2^42126451 is an apocalyptic number.

42126451 is a deficient number, since it is larger than the sum of its proper divisors (628821).

42126451 is an equidigital number, since it uses as much as digits as its factorization.

42126451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628820.

The product of its digits is 1920, while the sum is 25.

The square root of 42126451 is about 6490.4892727744. The cubic root of 42126451 is about 347.9511618389.

Adding to 42126451 its reverse (15462124), we get a palindrome (57588575).

The spelling of 42126451 in words is "forty-two million, one hundred twenty-six thousand, four hundred fifty-one".