42011531 has 4 divisors (see below), whose sum is σ = 42192072. Its totient is φ = 41830992.

The previous prime is 42011521. The next prime is 42011549. The reversal of 42011531 is 13511024.

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

It is a cyclic number.

It is not a de Polignac number, because 42011531 - 2¹⁴ = 41995147 is a prime.

It is a super-2 number, since 2×42011531² = 3529937473927922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42011521) 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, 89921 + ... + 90386.

It is an arithmetic number, because the mean of its divisors is an integer number (10548018).

Almost surely, 2^42011531 is an apocalyptic number.

42011531 is a deficient number, since it is larger than the sum of its proper divisors (180541).

42011531 is a wasteful number, since it uses less digits than its factorization.

42011531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180540.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 42011531 is about 6481.6302733186. The cubic root of 42011531 is about 347.6344727392.

Adding to 42011531 its reverse (13511024), we get a palindrome (55522555).

The spelling of 42011531 in words is "forty-two million, eleven thousand, five hundred thirty-one".