42011281 has 8 divisors (see below), whose sum is σ = 45863720. Its totient is φ = 38247552.

The previous prime is 42011251. The next prime is 42011287. The reversal of 42011281 is 18211024.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11937025 + 30074256 = 3455^2 + 5484^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42011281 - 2⁷ = 42011153 is a prime.

It is a super-2 number, since 2×42011281² = 3529895462521922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42011287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21186 + ... + 23083.

It is an arithmetic number, because the mean of its divisors is an integer number (5732965).

Almost surely, 2^42011281 is an apocalyptic number.

It is an amenable number.

42011281 is a deficient number, since it is larger than the sum of its proper divisors (3852439).

42011281 is a wasteful number, since it uses less digits than its factorization.

42011281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44355.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 42011281 is about 6481.6109880183. The cubic root of 42011281 is about 347.6337831762.

The spelling of 42011281 in words is "forty-two million, eleven thousand, two hundred eighty-one".