42091207 has 2 divisors, whose sum is σ = 42091208. Its totient is φ = 42091206.

The previous prime is 42091199. The next prime is 42091277. The reversal of 42091207 is 70219024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42091207 - 2³ = 42091199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42091277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045603 + 21045604.

It is an arithmetic number, because the mean of its divisors is an integer number (21045604).

Almost surely, 2^42091207 is an apocalyptic number.

42091207 is a deficient number, since it is larger than the sum of its proper divisors (1).

42091207 is an equidigital number, since it uses as much as digits as its factorization.

42091207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 42091207 is about 6487.7736551147. The cubic root of 42091207 is about 347.8541000013.

The spelling of 42091207 in words is "forty-two million, ninety-one thousand, two hundred seven".