42156511 has 2 divisors, whose sum is σ = 42156512. Its totient is φ = 42156510.

The previous prime is 42156473. The next prime is 42156523. The reversal of 42156511 is 11565124.

It is a happy number.

42156511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42156511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42156011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078255 + 21078256.

It is an arithmetic number, because the mean of its divisors is an integer number (21078256).

Almost surely, 2^42156511 is an apocalyptic number.

42156511 is a deficient number, since it is larger than the sum of its proper divisors (1).

42156511 is an equidigital number, since it uses as much as digits as its factorization.

42156511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 42156511 is about 6492.8045558141. The cubic root of 42156511 is about 348.0339041922.

The spelling of 42156511 in words is "forty-two million, one hundred fifty-six thousand, five hundred eleven".