490000261 has 2 divisors, whose sum is σ = 490000262. Its totient is φ = 490000260.

The previous prime is 490000243. The next prime is 490000283. The reversal of 490000261 is 162000094.

It is an a-pointer prime, because the next prime (490000283) can be obtained adding 490000261 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380484036 + 109516225 = 19506^2 + 10465^2 .

It is a cyclic number.

It is not a de Polignac number, because 490000261 - 2²⁷ = 355782533 is a prime.

It is a super-3 number, since 3×490000261³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490000961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245000130 + 245000131.

It is an arithmetic number, because the mean of its divisors is an integer number (245000131).

Almost surely, 2^490000261 is an apocalyptic number.

It is an amenable number.

490000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

490000261 is an equidigital number, since it uses as much as digits as its factorization.

490000261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 490000261 is about 22135.9495165669. The cubic root of 490000261 is about 788.3736562870.

The spelling of 490000261 in words is "four hundred ninety million, two hundred sixty-one", and thus it is an aban number.