261379 has 2 divisors, whose sum is σ = 261380. Its totient is φ = 261378.

The previous prime is 261353. The next prime is 261389. The reversal of 261379 is 973162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261379 - 2⁵ = 261347 is a prime.

It is an Ulam number.

261379 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (261329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130689 + 130690.

It is an arithmetic number, because the mean of its divisors is an integer number (130690).

2²⁶¹³⁷⁹ is an apocalyptic number.

261379 is a deficient number, since it is larger than the sum of its proper divisors (1).

261379 is an equidigital number, since it uses as much as digits as its factorization.

261379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 261379 is about 511.2523838575. The cubic root of 261379 is about 63.9376834830.

The spelling of 261379 in words is "two hundred sixty-one thousand, three hundred seventy-nine".