42556123 has 2 divisors, whose sum is σ = 42556124. Its totient is φ = 42556122.

The previous prime is 42556099. The next prime is 42556127. The reversal of 42556123 is 32165524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42556123 - 2⁵ = 42556091 is a prime.

It is a super-2 number, since 2×42556123² = 3622047209582258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42556091 and 42556100.

It is not a weakly prime, because it can be changed into another prime (42556127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21278061 + 21278062.

It is an arithmetic number, because the mean of its divisors is an integer number (21278062).

Almost surely, 2^42556123 is an apocalyptic number.

42556123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556123 is an equidigital number, since it uses as much as digits as its factorization.

42556123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 28.

The square root of 42556123 is about 6523.5054227003. The cubic root of 42556123 is about 349.1301474354.

The spelling of 42556123 in words is "forty-two million, five hundred fifty-six thousand, one hundred twenty-three".