4005123431 has 2 divisors, whose sum is σ = 4005123432. Its totient is φ = 4005123430.

The previous prime is 4005123413. The next prime is 4005123457. The reversal of 4005123431 is 1343215004.

Together with previous prime (4005123413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4005123431 is a prime.

It is a super-2 number, since 2×4005123431² = 32082027395090423522, 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 = 4005123397 and 4005123406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4005123401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2002561715 + 2002561716.

It is an arithmetic number, because the mean of its divisors is an integer number (2002561716).

Almost surely, 2^4005123431 is an apocalyptic number.

4005123431 is a deficient number, since it is larger than the sum of its proper divisors (1).

4005123431 is an equidigital number, since it uses as much as digits as its factorization.

4005123431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 4005123431 is about 63286.0445200994. The cubic root of 4005123431 is about 1588.0785077889.

Adding to 4005123431 its reverse (1343215004), we get a palindrome (5348338435).

The spelling of 4005123431 in words is "four billion, five million, one hundred twenty-three thousand, four hundred thirty-one".