42256507 has 2 divisors, whose sum is σ = 42256508. Its totient is φ = 42256506.

The previous prime is 42256483. The next prime is 42256519. The reversal of 42256507 is 70565224.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42256507 is a prime.

It is a super-2 number, since 2×42256507² = 3571224767682098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42256597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21128253 + 21128254.

It is an arithmetic number, because the mean of its divisors is an integer number (21128254).

Almost surely, 2^42256507 is an apocalyptic number.

42256507 is a deficient number, since it is larger than the sum of its proper divisors (1).

42256507 is an equidigital number, since it uses as much as digits as its factorization.

42256507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 42256507 is about 6500.5005191908. The cubic root of 42256507 is about 348.3088677876.

The spelling of 42256507 in words is "forty-two million, two hundred fifty-six thousand, five hundred seven".