42311131 has 2 divisors, whose sum is σ = 42311132. Its totient is φ = 42311130.

The previous prime is 42311111. The next prime is 42311153. The reversal of 42311131 is 13111324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42311131 - 2¹¹ = 42309083 is a prime.

It is a super-2 number, since 2×42311131² = 3580463612998322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42311111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21155565 + 21155566.

It is an arithmetic number, because the mean of its divisors is an integer number (21155566).

Almost surely, 2^42311131 is an apocalyptic number.

42311131 is a deficient number, since it is larger than the sum of its proper divisors (1).

42311131 is an equidigital number, since it uses as much as digits as its factorization.

42311131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 42311131 is about 6504.7006848894. The cubic root of 42311131 is about 348.4588867445.

Adding to 42311131 its reverse (13111324), we get a palindrome (55422455).

The spelling of 42311131 in words is "forty-two million, three hundred eleven thousand, one hundred thirty-one".