42207131 has 2 divisors, whose sum is σ = 42207132. Its totient is φ = 42207130.

The previous prime is 42207103. The next prime is 42207167. The reversal of 42207131 is 13170224.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42207131 is a prime.

It is a super-2 number, since 2×42207131² = 3562883814502322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42207931) 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, 21103565 + 21103566.

It is an arithmetic number, because the mean of its divisors is an integer number (21103566).

Almost surely, 2^42207131 is an apocalyptic number.

42207131 is a deficient number, since it is larger than the sum of its proper divisors (1).

42207131 is an equidigital number, since it uses as much as digits as its factorization.

42207131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 42207131 is about 6496.7015477087. The cubic root of 42207131 is about 348.1731506102.

Adding to 42207131 its reverse (13170224), we get a palindrome (55377355).

The spelling of 42207131 in words is "forty-two million, two hundred seven thousand, one hundred thirty-one".