2540000261 has 2 divisors, whose sum is σ = 2540000262. Its totient is φ = 2540000260.

The previous prime is 2540000189. The next prime is 2540000269. The reversal of 2540000261 is 1620000452.

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., 1376781025 + 1163219236 = 37105^2 + 34106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540000261 is a prime.

It is a super-3 number, since 3×2540000261³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540000269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270000130 + 1270000131.

It is an arithmetic number, because the mean of its divisors is an integer number (1270000131).

Almost surely, 2^2540000261 is an apocalyptic number.

It is an amenable number.

2540000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540000261 is an equidigital number, since it uses as much as digits as its factorization.

2540000261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2540000261 is about 50398.4152627838. The cubic root of 2540000261 is about 1364.4090364963.

The spelling of 2540000261 in words is "two billion, five hundred forty million, two hundred sixty-one", and thus it is an aban number.