438123131 has 2 divisors, whose sum is σ = 438123132. Its totient is φ = 438123130.

The previous prime is 438123107. The next prime is 438123157. The reversal of 438123131 is 131321834.

It is an a-pointer prime, because the next prime (438123157) can be obtained adding 438123131 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 438123131 - 2¹⁸ = 437860987 is a prime.

It is a super-2 number, since 2×438123131² = 383903755834486322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 438123131.

It is not a weakly prime, because it can be changed into another prime (438123731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219061565 + 219061566.

It is an arithmetic number, because the mean of its divisors is an integer number (219061566).

Almost surely, 2^438123131 is an apocalyptic number.

438123131 is a deficient number, since it is larger than the sum of its proper divisors (1).

438123131 is an equidigital number, since it uses as much as digits as its factorization.

438123131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 438123131 is about 20931.3910431199. The cubic root of 438123131 is about 759.5074896514.

Adding to 438123131 its reverse (131321834), we get a palindrome (569444965).

The spelling of 438123131 in words is "four hundred thirty-eight million, one hundred twenty-three thousand, one hundred thirty-one".