42111031 has 4 divisors (see below), whose sum is σ = 42390064. Its totient is φ = 41832000.

The previous prime is 42111007. The next prime is 42111053. The reversal of 42111031 is 13011124.

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 42111031 - 2¹³ = 42102839 is a prime.

It is a super-2 number, since 2×42111031² = 3546677863765922, 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 (42111001) 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, 139290 + ... + 139591.

It is an arithmetic number, because the mean of its divisors is an integer number (10597516).

Almost surely, 2^42111031 is an apocalyptic number.

42111031 is a deficient number, since it is larger than the sum of its proper divisors (279033).

42111031 is a wasteful number, since it uses less digits than its factorization.

42111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279032.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 42111031 is about 6489.3012720939. The cubic root of 42111031 is about 347.9087018834.

Adding to 42111031 its reverse (13011124), we get a palindrome (55122155).

The spelling of 42111031 in words is "forty-two million, one hundred eleven thousand, thirty-one".