491501473 has 2 divisors, whose sum is σ = 491501474. Its totient is φ = 491501472.

The previous prime is 491501441. The next prime is 491501503. The reversal of 491501473 is 374105194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451647504 + 39853969 = 21252^2 + 6313^2 .

It is a cyclic number.

It is not a de Polignac number, because 491501473 - 2⁵ = 491501441 is a prime.

It is a super-2 number, since 2×491501473² = 483147395922339458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491501273) 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, 245750736 + 245750737.

It is an arithmetic number, because the mean of its divisors is an integer number (245750737).

Almost surely, 2^491501473 is an apocalyptic number.

It is an amenable number.

491501473 is a deficient number, since it is larger than the sum of its proper divisors (1).

491501473 is an equidigital number, since it uses as much as digits as its factorization.

491501473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 491501473 is about 22169.8324982396. The cubic root of 491501473 is about 789.1779479686.

The spelling of 491501473 in words is "four hundred ninety-one million, five hundred one thousand, four hundred seventy-three".