664124231 has 2 divisors, whose sum is σ = 664124232. Its totient is φ = 664124230.

The previous prime is 664124221. The next prime is 664124249. The reversal of 664124231 is 132421466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664124231 is a prime.

It is a super-2 number, since 2×664124231² = 882121988402682722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 664124194 and 664124203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664124221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332062115 + 332062116.

It is an arithmetic number, because the mean of its divisors is an integer number (332062116).

Almost surely, 2^664124231 is an apocalyptic number.

664124231 is a deficient number, since it is larger than the sum of its proper divisors (1).

664124231 is an equidigital number, since it uses as much as digits as its factorization.

664124231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 664124231 is about 25770.6078896094. The cubic root of 664124231 is about 872.4685389706.

Adding to 664124231 its reverse (132421466), we get a palindrome (796545697).

It can be divided in two parts, 6641242 and 31, that multiplied together give a palindrome (205878502).

The spelling of 664124231 in words is "six hundred sixty-four million, one hundred twenty-four thousand, two hundred thirty-one".