42115181 has 4 divisors (see below), whose sum is σ = 42252672. Its totient is φ = 41977692.

The previous prime is 42115147. The next prime is 42115187. The reversal of 42115181 is 18151124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42115181 - 2¹⁸ = 41853037 is a prime.

It is a super-2 number, since 2×42115181² = 3547376941325522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42115187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68285 + ... + 68898.

It is an arithmetic number, because the mean of its divisors is an integer number (10563168).

Almost surely, 2^42115181 is an apocalyptic number.

It is an amenable number.

42115181 is a deficient number, since it is larger than the sum of its proper divisors (137491).

42115181 is a wasteful number, since it uses less digits than its factorization.

42115181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137490.

The product of its digits is 320, while the sum is 23.

The square root of 42115181 is about 6489.6210212924. The cubic root of 42115181 is about 347.9201301929.

The spelling of 42115181 in words is "forty-two million, one hundred fifteen thousand, one hundred eighty-one".