523491491 has 2 divisors, whose sum is σ = 523491492. Its totient is φ = 523491490.

The previous prime is 523491473. The next prime is 523491511. The reversal of 523491491 is 194194325.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 523491491 - 2⁶ = 523491427 is a prime.

It is a super-2 number, since 2×523491491² = 548086682298806162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (523491461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261745745 + 261745746.

It is an arithmetic number, because the mean of its divisors is an integer number (261745746).

Almost surely, 2^523491491 is an apocalyptic number.

523491491 is a deficient number, since it is larger than the sum of its proper divisors (1).

523491491 is an equidigital number, since it uses as much as digits as its factorization.

523491491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 523491491 is about 22879.9364291075. The cubic root of 523491491 is about 805.9409241285.

The spelling of 523491491 in words is "five hundred twenty-three million, four hundred ninety-one thousand, four hundred ninety-one".