261284377 has 2 divisors, whose sum is σ = 261284378. Its totient is φ = 261284376.

The previous prime is 261284351. The next prime is 261284381. The reversal of 261284377 is 773482162.

261284377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248724441 + 12559936 = 15771^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 261284377 - 2¹⁵ = 261251609 is a prime.

It is not a weakly prime, because it can be changed into another prime (261284077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130642188 + 130642189.

It is an arithmetic number, because the mean of its divisors is an integer number (130642189).

Almost surely, 2^261284377 is an apocalyptic number.

It is an amenable number.

261284377 is a deficient number, since it is larger than the sum of its proper divisors (1).

261284377 is an equidigital number, since it uses as much as digits as its factorization.

261284377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 40.

The square root of 261284377 is about 16164.2932725189. The cubic root of 261284377 is about 639.2996709463.

The spelling of 261284377 in words is "two hundred sixty-one million, two hundred eighty-four thousand, three hundred seventy-seven".