261003409 has 2 divisors, whose sum is σ = 261003410. Its totient is φ = 261003408.

The previous prime is 261003403. The next prime is 261003481. The reversal of 261003409 is 904300162.

261003409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244234384 + 16769025 = 15628^2 + 4095^2 .

It is a cyclic number.

It is not a de Polignac number, because 261003409 - 2³ = 261003401 is a prime.

It is not a weakly prime, because it can be changed into another prime (261003401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130501704 + 130501705.

It is an arithmetic number, because the mean of its divisors is an integer number (130501705).

Almost surely, 2^261003409 is an apocalyptic number.

It is an amenable number.

261003409 is a deficient number, since it is larger than the sum of its proper divisors (1).

261003409 is an equidigital number, since it uses as much as digits as its factorization.

261003409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 261003409 is about 16155.5999269603. The cubic root of 261003409 is about 639.0704351798.

The spelling of 261003409 in words is "two hundred sixty-one million, three thousand, four hundred nine".