406322281993 has 2 divisors, whose sum is σ = 406322281994. Its totient is φ = 406322281992.

The previous prime is 406322281973. The next prime is 406322282077. The reversal of 406322281993 is 399182223604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321764621049 + 84557660944 = 567243^2 + 290788^2 .

It is a cyclic number.

It is not a de Polignac number, because 406322281993 - 2⁹ = 406322281481 is a prime.

It is not a weakly prime, because it can be changed into another prime (406322281973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203161140996 + 203161140997.

It is an arithmetic number, because the mean of its divisors is an integer number (203161140997).

Almost surely, 2^406322281993 is an apocalyptic number.

It is an amenable number.

406322281993 is a deficient number, since it is larger than the sum of its proper divisors (1).

406322281993 is an equidigital number, since it uses as much as digits as its factorization.

406322281993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 406322281993 in words is "four hundred six billion, three hundred twenty-two million, two hundred eighty-one thousand, nine hundred ninety-three".