42115771 has 2 divisors, whose sum is σ = 42115772. Its totient is φ = 42115770.

The previous prime is 42115757. The next prime is 42115789. The reversal of 42115771 is 17751124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42115771 - 2⁷ = 42115643 is a prime.

It is not a weakly prime, because it can be changed into another prime (42115741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21057885 + 21057886.

It is an arithmetic number, because the mean of its divisors is an integer number (21057886).

Almost surely, 2^42115771 is an apocalyptic number.

42115771 is a deficient number, since it is larger than the sum of its proper divisors (1).

42115771 is an equidigital number, since it uses as much as digits as its factorization.

42115771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 28.

The square root of 42115771 is about 6489.6664783331. Note that the first 3 decimals coincide. The cubic root of 42115771 is about 347.9217548795.

Adding to 42115771 its reverse (17751124), we get a palindrome (59866895).

The spelling of 42115771 in words is "forty-two million, one hundred fifteen thousand, seven hundred seventy-one".