261379123 has 2 divisors, whose sum is σ = 261379124. Its totient is φ = 261379122.

The previous prime is 261379109. The next prime is 261379159. The reversal of 261379123 is 321973162.

261379123 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 is a cyclic number.

It is not a de Polignac number, because 261379123 - 2⁵ = 261379091 is a prime.

It is not a weakly prime, because it can be changed into another prime (261379103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130689561 + 130689562.

It is an arithmetic number, because the mean of its divisors is an integer number (130689562).

Almost surely, 2^261379123 is an apocalyptic number.

261379123 is a deficient number, since it is larger than the sum of its proper divisors (1).

261379123 is an equidigital number, since it uses as much as digits as its factorization.

261379123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 261379123 is about 16167.2237257978. The cubic root of 261379123 is about 639.3769351229.

The spelling of 261379123 in words is "two hundred sixty-one million, three hundred seventy-nine thousand, one hundred twenty-three".