42431311 has 4 divisors (see below), whose sum is σ = 45695272. Its totient is φ = 39167352.

The previous prime is 42431273. The next prime is 42431317. The reversal of 42431311 is 11313424.

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 42431311 - 2¹³ = 42423119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42431317) 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, 1631961 + ... + 1631986.

It is an arithmetic number, because the mean of its divisors is an integer number (11423818).

Almost surely, 2^42431311 is an apocalyptic number.

42431311 is a deficient number, since it is larger than the sum of its proper divisors (3263961).

42431311 is a wasteful number, since it uses less digits than its factorization.

42431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263960.

The product of its digits is 288, while the sum is 19.

The square root of 42431311 is about 6513.9320690348. The cubic root of 42431311 is about 348.7884942714.

Adding to 42431311 its reverse (11313424), we get a palindrome (53744735).

The spelling of 42431311 in words is "forty-two million, four hundred thirty-one thousand, three hundred eleven".