493195921 has 2 divisors, whose sum is σ = 493195922. Its totient is φ = 493195920.

The previous prime is 493195909. The next prime is 493195999. The reversal of 493195921 is 129591394.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466560000 + 26635921 = 21600^2 + 5161^2 .

It is a cyclic number.

It is not a de Polignac number, because 493195921 - 2⁵ = 493195889 is a prime.

It is not a weakly prime, because it can be changed into another prime (493195121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246597960 + 246597961.

It is an arithmetic number, because the mean of its divisors is an integer number (246597961).

Almost surely, 2^493195921 is an apocalyptic number.

It is an amenable number.

493195921 is a deficient number, since it is larger than the sum of its proper divisors (1).

493195921 is an equidigital number, since it uses as much as digits as its factorization.

493195921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 493195921 is about 22208.0147919619. The cubic root of 493195921 is about 790.0838029990.

The spelling of 493195921 in words is "four hundred ninety-three million, one hundred ninety-five thousand, nine hundred twenty-one".