491940523 has 2 divisors, whose sum is σ = 491940524. Its totient is φ = 491940522.

The previous prime is 491940521. The next prime is 491940529. The reversal of 491940523 is 325049194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491940523 - 2¹ = 491940521 is a prime.

Together with 491940521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (491940521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245970261 + 245970262.

It is an arithmetic number, because the mean of its divisors is an integer number (245970262).

Almost surely, 2^491940523 is an apocalyptic number.

491940523 is a deficient number, since it is larger than the sum of its proper divisors (1).

491940523 is an equidigital number, since it uses as much as digits as its factorization.

491940523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 491940523 is about 22179.7322571757. The cubic root of 491940523 is about 789.4128644965.

The spelling of 491940523 in words is "four hundred ninety-one million, nine hundred forty thousand, five hundred twenty-three".