42401231 has 2 divisors, whose sum is σ = 42401232. Its totient is φ = 42401230.

The previous prime is 42401209. The next prime is 42401237. The reversal of 42401231 is 13210424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42401231 - 2¹⁰ = 42400207 is a prime.

It is a super-2 number, since 2×42401231² = 3595728780630722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42401237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200615 + 21200616.

It is an arithmetic number, because the mean of its divisors is an integer number (21200616).

Almost surely, 2^42401231 is an apocalyptic number.

42401231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42401231 is an equidigital number, since it uses as much as digits as its factorization.

42401231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42401231 is about 6511.6227624149. The cubic root of 42401231 is about 348.7060548509.

Adding to 42401231 its reverse (13210424), we get a palindrome (55611655).

The spelling of 42401231 in words is "forty-two million, four hundred one thousand, two hundred thirty-one".