493897993 has 2 divisors, whose sum is σ = 493897994. Its totient is φ = 493897992.

The previous prime is 493897981. The next prime is 493898003. The reversal of 493897993 is 399798394.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443018304 + 50879689 = 21048^2 + 7133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-493897993 is a prime.

It is not a weakly prime, because it can be changed into another prime (493897693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246948996 + 246948997.

It is an arithmetic number, because the mean of its divisors is an integer number (246948997).

Almost surely, 2^493897993 is an apocalyptic number.

It is an amenable number.

493897993 is a deficient number, since it is larger than the sum of its proper divisors (1).

493897993 is an equidigital number, since it uses as much as digits as its factorization.

493897993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 61.

The square root of 493897993 is about 22223.8158964657. The cubic root of 493897993 is about 790.4585240744.

The spelling of 493897993 in words is "four hundred ninety-three million, eight hundred ninety-seven thousand, nine hundred ninety-three".