490771781 has 2 divisors, whose sum is σ = 490771782. Its totient is φ = 490771780.

The previous prime is 490771753. The next prime is 490771783. The reversal of 490771781 is 187177094.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472845025 + 17926756 = 21745^2 + 4234^2 .

It is a cyclic number.

It is not a de Polignac number, because 490771781 - 2²² = 486577477 is a prime.

It is a super-2 number, since 2×490771781² = 481713882051823922, which contains 22 as substring.

Together with 490771783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490771783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245385890 + 245385891.

It is an arithmetic number, because the mean of its divisors is an integer number (245385891).

Almost surely, 2^490771781 is an apocalyptic number.

It is an amenable number.

490771781 is a deficient number, since it is larger than the sum of its proper divisors (1).

490771781 is an equidigital number, since it uses as much as digits as its factorization.

490771781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 44.

The square root of 490771781 is about 22153.3695179763. The cubic root of 490771781 is about 788.7872119092.

The spelling of 490771781 in words is "four hundred ninety million, seven hundred seventy-one thousand, seven hundred eighty-one".