491400523 has 2 divisors, whose sum is σ = 491400524. Its totient is φ = 491400522.

The previous prime is 491400479. The next prime is 491400541. The reversal of 491400523 is 325004194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491400523 - 2¹³ = 491392331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491400491 and 491400500.

It is not a weakly prime, because it can be changed into another prime (491400823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245700261 + 245700262.

It is an arithmetic number, because the mean of its divisors is an integer number (245700262).

Almost surely, 2^491400523 is an apocalyptic number.

491400523 is a deficient number, since it is larger than the sum of its proper divisors (1).

491400523 is an equidigital number, since it uses as much as digits as its factorization.

491400523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 491400523 is about 22167.5556388159. Note that the first 3 decimals coincide. The cubic root of 491400523 is about 789.1239142419.

The spelling of 491400523 in words is "four hundred ninety-one million, four hundred thousand, five hundred twenty-three".