1375000261 has 2 divisors, whose sum is σ = 1375000262. Its totient is φ = 1375000260.

The previous prime is 1375000259. The next prime is 1375000343. The reversal of 1375000261 is 1620005731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1047752161 + 327248100 = 32369^2 + 18090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375000261 - 2¹ = 1375000259 is a prime.

Together with 1375000259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375000661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687500130 + 687500131.

It is an arithmetic number, because the mean of its divisors is an integer number (687500131).

Almost surely, 2^1375000261 is an apocalyptic number.

It is an amenable number.

1375000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375000261 is an equidigital number, since it uses as much as digits as its factorization.

1375000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 1375000261 is about 37080.9959548014. The cubic root of 1375000261 is about 1111.9901156433.

Adding to 1375000261 its reverse (1620005731), we get a palindrome (2995005992).

The spelling of 1375000261 in words is "one billion, three hundred seventy-five million, two hundred sixty-one", and thus it is an aban number.