6403138631 has 2 divisors, whose sum is σ = 6403138632. Its totient is φ = 6403138630.

The previous prime is 6403138601. The next prime is 6403138639. The reversal of 6403138631 is 1368313046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6403138631 - 2¹⁰ = 6403137607 is a prime.

It is a super-2 number, since 2×6403138631² = 82000368655609108322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6403138591 and 6403138600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6403138639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201569315 + 3201569316.

It is an arithmetic number, because the mean of its divisors is an integer number (3201569316).

Almost surely, 2^6403138631 is an apocalyptic number.

6403138631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403138631 is an equidigital number, since it uses as much as digits as its factorization.

6403138631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 6403138631 is about 80019.6140393091. The cubic root of 6403138631 is about 1856.9389887321.

The spelling of 6403138631 in words is "six billion, four hundred three million, one hundred thirty-eight thousand, six hundred thirty-one".