643071406031 has 2 divisors, whose sum is σ = 643071406032. Its totient is φ = 643071406030.

The previous prime is 643071406013. The next prime is 643071406049. The reversal of 643071406031 is 130604170346.

Together with previous prime (643071406013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (643071406013) and next prime (643071406049).

It is a cyclic number.

It is not a de Polignac number, because 643071406031 - 2⁶ = 643071405967 is a prime.

It is a super-2 number, since 2×643071406031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643071405982 and 643071406000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643071400031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321535703015 + 321535703016.

It is an arithmetic number, because the mean of its divisors is an integer number (321535703016).

Almost surely, 2^643071406031 is an apocalyptic number.

643071406031 is a deficient number, since it is larger than the sum of its proper divisors (1).

643071406031 is an equidigital number, since it uses as much as digits as its factorization.

643071406031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 35.

Adding to 643071406031 its reverse (130604170346), we get a palindrome (773675576377).

The spelling of 643071406031 in words is "six hundred forty-three billion, seventy-one million, four hundred six thousand, thirty-one".