42661247 has 2 divisors, whose sum is σ = 42661248. Its totient is φ = 42661246.

The previous prime is 42661243. The next prime is 42661271. The reversal of 42661247 is 74216624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42661247 - 2² = 42661243 is a prime.

It is a Chen prime.

It is equal to p_2585354 and since 42661247 and 2585354 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42661243) 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, 21330623 + 21330624.

It is an arithmetic number, because the mean of its divisors is an integer number (21330624).

Almost surely, 2^42661247 is an apocalyptic number.

42661247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42661247 is an equidigital number, since it uses as much as digits as its factorization.

42661247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 42661247 is about 6531.5577774372. The cubic root of 42661247 is about 349.4173899089.

The spelling of 42661247 in words is "forty-two million, six hundred sixty-one thousand, two hundred forty-seven".