42056551 has 2 divisors, whose sum is σ = 42056552. Its totient is φ = 42056550.

The previous prime is 42056543. The next prime is 42056561. The reversal of 42056551 is 15565024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42056551 - 2³ = 42056543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42056561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21028275 + 21028276.

It is an arithmetic number, because the mean of its divisors is an integer number (21028276).

Almost surely, 2^42056551 is an apocalyptic number.

42056551 is a deficient number, since it is larger than the sum of its proper divisors (1).

42056551 is an equidigital number, since it uses as much as digits as its factorization.

42056551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 42056551 is about 6485.1022351232. The cubic root of 42056551 is about 347.7586046660.

The spelling of 42056551 in words is "forty-two million, fifty-six thousand, five hundred fifty-one".