42451 has 2 divisors, whose sum is σ = 42452. Its totient is φ = 42450.

The previous prime is 42443. The next prime is 42457. The reversal of 42451 is 15424.

42451 is nontrivially palindromic in base 11.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42451 - 2³ = 42443 is a prime.

It is an Ulam number.

42451 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (42457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225 + 21226.

It is an arithmetic number, because the mean of its divisors is an integer number (21226).

2⁴²⁴⁵¹ is an apocalyptic number.

42451 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451 is an equidigital number, since it uses as much as digits as its factorization.

42451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160, while the sum is 16.

The square root of 42451 is about 206.0364045503. The cubic root of 42451 is about 34.8842434271.

Adding to 42451 its reverse (15424), we get a palindrome (57875).

The spelling of 42451 in words is "forty-two thousand, four hundred fifty-one".