42819251 has 2 divisors, whose sum is σ = 42819252. Its totient is φ = 42819250.

The previous prime is 42819223. The next prime is 42819289. The reversal of 42819251 is 15291824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42819251 is a prime.

It is equal to p_2594363 and since 42819251 and 2594363 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42819551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409625 + 21409626.

It is an arithmetic number, because the mean of its divisors is an integer number (21409626).

Almost surely, 2^42819251 is an apocalyptic number.

42819251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42819251 is an equidigital number, since it uses as much as digits as its factorization.

42819251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 42819251 is about 6543.6420287176. The cubic root of 42819251 is about 349.8482362439.

The spelling of 42819251 in words is "forty-two million, eight hundred nineteen thousand, two hundred fifty-one".