490812761 has 2 divisors, whose sum is σ = 490812762. Its totient is φ = 490812760.

The previous prime is 490812727. The next prime is 490812779. The reversal of 490812761 is 167218094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461175625 + 29637136 = 21475^2 + 5444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490812761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (490812961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245406380 + 245406381.

It is an arithmetic number, because the mean of its divisors is an integer number (245406381).

Almost surely, 2^490812761 is an apocalyptic number.

It is an amenable number.

490812761 is a deficient number, since it is larger than the sum of its proper divisors (1).

490812761 is an equidigital number, since it uses as much as digits as its factorization.

490812761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 490812761 is about 22154.2944144019. The cubic root of 490812761 is about 788.8091661736.

The spelling of 490812761 in words is "four hundred ninety million, eight hundred twelve thousand, seven hundred sixty-one".