42165247 has 2 divisors, whose sum is σ = 42165248. Its totient is φ = 42165246.

The previous prime is 42165229. The next prime is 42165293. The reversal of 42165247 is 74256124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42165247 - 2¹⁹ = 41640959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42165947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082623 + 21082624.

It is an arithmetic number, because the mean of its divisors is an integer number (21082624).

Almost surely, 2^42165247 is an apocalyptic number.

42165247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42165247 is an equidigital number, since it uses as much as digits as its factorization.

42165247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 42165247 is about 6493.4772656875. The cubic root of 42165247 is about 348.0579432957.

The spelling of 42165247 in words is "forty-two million, one hundred sixty-five thousand, two hundred forty-seven".