493586455703921 has 2 divisors, whose sum is σ = 493586455703922. Its totient is φ = 493586455703920.

The previous prime is 493586455703897. The next prime is 493586455703947. The reversal of 493586455703921 is 129307554685394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271104918589696 + 222481537114225 = 16465264^2 + 14915815^2 .

It is a cyclic number.

It is not a de Polignac number, because 493586455703921 - 2¹⁸ = 493586455441777 is a prime.

It is a super-2 number, since 2×493586455703921² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (493586455783921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246793227851960 + 246793227851961.

It is an arithmetic number, because the mean of its divisors is an integer number (246793227851961).

It is a 1-persistent number, because it is pandigital, but 2⋅493586455703921 = 987172911407842 is not.

Almost surely, 2^{493586455703921} is an apocalyptic number.

It is an amenable number.

493586455703921 is a deficient number, since it is larger than the sum of its proper divisors (1).

493586455703921 is an equidigital number, since it uses as much as digits as its factorization.

493586455703921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776000, while the sum is 71.

The spelling of 493586455703921 in words is "four hundred ninety-three trillion, five hundred eighty-six billion, four hundred fifty-five million, seven hundred three thousand, nine hundred twenty-one".