491749338354977 has 2 divisors, whose sum is σ = 491749338354978. Its totient is φ = 491749338354976.

The previous prime is 491749338354881. The next prime is 491749338355013. The reversal of 491749338354977 is 779453833947194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366705035407936 + 125044302947041 = 19149544^2 + 11182321^2 .

It is a cyclic number.

It is not a de Polignac number, because 491749338354977 - 2¹⁴ = 491749338338593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491749338354895 and 491749338354904.

It is not a weakly prime, because it can be changed into another prime (491749338351977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245874669177488 + 245874669177489.

It is an arithmetic number, because the mean of its divisors is an integer number (245874669177489).

Almost surely, 2^{491749338354977} is an apocalyptic number.

It is an amenable number.

491749338354977 is a deficient number, since it is larger than the sum of its proper divisors (1).

491749338354977 is an equidigital number, since it uses as much as digits as its factorization.

491749338354977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17283248640, while the sum is 83.

The spelling of 491749338354977 in words is "four hundred ninety-one trillion, seven hundred forty-nine billion, three hundred thirty-eight million, three hundred fifty-four thousand, nine hundred seventy-seven".