42251291 has 2 divisors, whose sum is σ = 42251292. Its totient is φ = 42251290.

The previous prime is 42251267. The next prime is 42251303. The reversal of 42251291 is 19215224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42251291 - 2⁶ = 42251227 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42251291.

It is not a weakly prime, because it can be changed into another prime (42251191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21125645 + 21125646.

It is an arithmetic number, because the mean of its divisors is an integer number (21125646).

Almost surely, 2^42251291 is an apocalyptic number.

42251291 is a deficient number, since it is larger than the sum of its proper divisors (1).

42251291 is an equidigital number, since it uses as much as digits as its factorization.

42251291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 42251291 is about 6500.0993069337. The cubic root of 42251291 is about 348.2945358425.

The spelling of 42251291 in words is "forty-two million, two hundred fifty-one thousand, two hundred ninety-one".