406494791028581 has 2 divisors, whose sum is σ = 406494791028582. Its totient is φ = 406494791028580.

The previous prime is 406494791028559. The next prime is 406494791028673. The reversal of 406494791028581 is 185820197494604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247730002992481 + 158764788036100 = 15739441^2 + 12600190^2 .

It is a cyclic number.

It is not a de Polignac number, because 406494791028581 - 2⁶ = 406494791028517 is a prime.

It is a super-2 number, since 2×406494791028581² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406494791028541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203247395514290 + 203247395514291.

It is an arithmetic number, because the mean of its divisors is an integer number (203247395514291).

Almost surely, 2^{406494791028581} is an apocalyptic number.

It is an amenable number.

406494791028581 is a deficient number, since it is larger than the sum of its proper divisors (1).

406494791028581 is an equidigital number, since it uses as much as digits as its factorization.

406494791028581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139345920, while the sum is 68.

The spelling of 406494791028581 in words is "four hundred six trillion, four hundred ninety-four billion, seven hundred ninety-one million, twenty-eight thousand, five hundred eighty-one".