491603573 has 2 divisors, whose sum is σ = 491603574. Its totient is φ = 491603572.

The previous prime is 491603551. The next prime is 491603579. The reversal of 491603573 is 375306194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 452753284 + 38850289 = 21278^2 + 6233^2 .

It is a cyclic number.

It is not a de Polignac number, because 491603573 - 2⁸ = 491603317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491603579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245801786 + 245801787.

It is an arithmetic number, because the mean of its divisors is an integer number (245801787).

Almost surely, 2^491603573 is an apocalyptic number.

It is an amenable number.

491603573 is a deficient number, since it is larger than the sum of its proper divisors (1).

491603573 is an equidigital number, since it uses as much as digits as its factorization.

491603573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 491603573 is about 22172.1350573191. The cubic root of 491603573 is about 789.2325897105.

The spelling of 491603573 in words is "four hundred ninety-one million, six hundred three thousand, five hundred seventy-three".