491062309 has 2 divisors, whose sum is σ = 491062310. Its totient is φ = 491062308.

The previous prime is 491062241. The next prime is 491062321. The reversal of 491062309 is 903260194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330330625 + 160731684 = 18175^2 + 12678^2 .

It is a cyclic number.

It is not a de Polignac number, because 491062309 - 2⁷ = 491062181 is a prime.

It is a super-2 number, since 2×491062309² = 482284382640822962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491062009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245531154 + 245531155.

It is an arithmetic number, because the mean of its divisors is an integer number (245531155).

Almost surely, 2^491062309 is an apocalyptic number.

It is an amenable number.

491062309 is a deficient number, since it is larger than the sum of its proper divisors (1).

491062309 is an equidigital number, since it uses as much as digits as its factorization.

491062309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 491062309 is about 22159.9257444604. The cubic root of 491062309 is about 788.9428304502.

It can be divided in two parts, 49106 and 2309, that added together give a palindrome (51415).

The spelling of 491062309 in words is "four hundred ninety-one million, sixty-two thousand, three hundred nine".