493818421 has 2 divisors, whose sum is σ = 493818422. Its totient is φ = 493818420.

The previous prime is 493818389. The next prime is 493818427. The reversal of 493818421 is 124818394.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487791396 + 6027025 = 22086^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 493818421 - 2⁵ = 493818389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (493818427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246909210 + 246909211.

It is an arithmetic number, because the mean of its divisors is an integer number (246909211).

Almost surely, 2^493818421 is an apocalyptic number.

It is an amenable number.

493818421 is a deficient number, since it is larger than the sum of its proper divisors (1).

493818421 is an equidigital number, since it uses as much as digits as its factorization.

493818421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 493818421 is about 22222.0255827411. The cubic root of 493818421 is about 790.4160714866.

The spelling of 493818421 in words is "four hundred ninety-three million, eight hundred eighteen thousand, four hundred twenty-one".