42145451 has 4 divisors (see below), whose sum is σ = 42467304. Its totient is φ = 41823600.

The previous prime is 42145429. The next prime is 42145457. The reversal of 42145451 is 15454124.

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 42145451 - 2¹⁸ = 41883307 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 42145451.

It is not an unprimeable number, because it can be changed into a prime (42145457) 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, 160730 + ... + 160991.

It is an arithmetic number, because the mean of its divisors is an integer number (10616826).

Almost surely, 2^42145451 is an apocalyptic number.

42145451 is a deficient number, since it is larger than the sum of its proper divisors (321853).

42145451 is a wasteful number, since it uses less digits than its factorization.

42145451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321852.

The product of its digits is 3200, while the sum is 26.

The square root of 42145451 is about 6491.9527878752. The cubic root of 42145451 is about 348.0034653066.

Adding to 42145451 its reverse (15454124), we get a palindrome (57599575).

The spelling of 42145451 in words is "forty-two million, one hundred forty-five thousand, four hundred fifty-one".