42401251 has 2 divisors, whose sum is σ = 42401252. Its totient is φ = 42401250.

The previous prime is 42401243. The next prime is 42401263. The reversal of 42401251 is 15210424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42401251 - 2³ = 42401243 is a prime.

It is not a weakly prime, because it can be changed into another prime (42401201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200625 + 21200626.

It is an arithmetic number, because the mean of its divisors is an integer number (21200626).

Almost surely, 2^42401251 is an apocalyptic number.

42401251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42401251 is an equidigital number, since it uses as much as digits as its factorization.

42401251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 42401251 is about 6511.6242981302. The cubic root of 42401251 is about 348.7061096773.

Adding to 42401251 its reverse (15210424), we get a palindrome (57611675).

The spelling of 42401251 in words is "forty-two million, four hundred one thousand, two hundred fifty-one".