42081051 has 4 divisors (see below), whose sum is σ = 56108072. Its totient is φ = 28054032.

The previous prime is 42081019. The next prime is 42081089. The reversal of 42081051 is 15018024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42081051 - 2⁵ = 42081019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42081451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7013506 + ... + 7013511.

It is an arithmetic number, because the mean of its divisors is an integer number (14027018).

Almost surely, 2^42081051 is an apocalyptic number.

42081051 is a deficient number, since it is larger than the sum of its proper divisors (14027021).

42081051 is a wasteful number, since it uses less digits than its factorization.

42081051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14027020.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 42081051 is about 6486.9909048803. The cubic root of 42081051 is about 347.8261203616.

Adding to 42081051 its reverse (15018024), we get a palindrome (57099075).

The spelling of 42081051 in words is "forty-two million, eighty-one thousand, fifty-one".