42531451 has 2 divisors, whose sum is σ = 42531452. Its totient is φ = 42531450.

The previous prime is 42531431. The next prime is 42531469. The reversal of 42531451 is 15413524.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42531451 is a prime.

It is not a weakly prime, because it can be changed into another prime (42531431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265725 + 21265726.

It is an arithmetic number, because the mean of its divisors is an integer number (21265726).

Almost surely, 2^42531451 is an apocalyptic number.

42531451 is a deficient number, since it is larger than the sum of its proper divisors (1).

42531451 is an equidigital number, since it uses as much as digits as its factorization.

42531451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 42531451 is about 6521.6141406863. The cubic root of 42531451 is about 349.0626647518.

Adding to 42531451 its reverse (15413524), we get a palindrome (57944975).

The spelling of 42531451 in words is "forty-two million, five hundred thirty-one thousand, four hundred fifty-one".