490187980781 has 2 divisors, whose sum is σ = 490187980782. Its totient is φ = 490187980780.

The previous prime is 490187980759. The next prime is 490187980801. The reversal of 490187980781 is 187089781094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480034194025 + 10153786756 = 692845^2 + 100766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490187980781 is a prime.

It is a super-2 number, since 2×490187980781² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490187980741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245093990390 + 245093990391.

It is an arithmetic number, because the mean of its divisors is an integer number (245093990391).

Almost surely, 2^490187980781 is an apocalyptic number.

It is an amenable number.

490187980781 is a deficient number, since it is larger than the sum of its proper divisors (1).

490187980781 is an equidigital number, since it uses as much as digits as its factorization.

490187980781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8128512, while the sum is 62.

The spelling of 490187980781 in words is "four hundred ninety billion, one hundred eighty-seven million, nine hundred eighty thousand, seven hundred eighty-one".