42256523 has 2 divisors, whose sum is σ = 42256524. Its totient is φ = 42256522.

The previous prime is 42256519. The next prime is 42256531. The reversal of 42256523 is 32565224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42256523 - 2² = 42256519 is a prime.

It is a super-2 number, since 2×42256523² = 3571227472099058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42258523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21128261 + 21128262.

It is an arithmetic number, because the mean of its divisors is an integer number (21128262).

Almost surely, 2^42256523 is an apocalyptic number.

42256523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42256523 is an equidigital number, since it uses as much as digits as its factorization.

42256523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 29.

The square root of 42256523 is about 6500.5017498652. The cubic root of 42256523 is about 348.3089117488.

The spelling of 42256523 in words is "forty-two million, two hundred fifty-six thousand, five hundred twenty-three".