42531311 has 2 divisors, whose sum is σ = 42531312. Its totient is φ = 42531310.

The previous prime is 42531289. The next prime is 42531319. The reversal of 42531311 is 11313524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42531311 - 2¹⁰ = 42530287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42531319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265655 + 21265656.

It is an arithmetic number, because the mean of its divisors is an integer number (21265656).

Almost surely, 2^42531311 is an apocalyptic number.

42531311 is a deficient number, since it is larger than the sum of its proper divisors (1).

42531311 is an equidigital number, since it uses as much as digits as its factorization.

42531311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 42531311 is about 6521.6034071385. The cubic root of 42531311 is about 349.0622817504.

Adding to 42531311 its reverse (11313524), we get a palindrome (53844835).

The spelling of 42531311 in words is "forty-two million, five hundred thirty-one thousand, three hundred eleven".