261089377 has 2 divisors, whose sum is σ = 261089378. Its totient is φ = 261089376.

The previous prime is 261089359. The next prime is 261089401. The reversal of 261089377 is 773980162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216413521 + 44675856 = 14711^2 + 6684^2 .

It is a cyclic number.

It is not a de Polignac number, because 261089377 - 2¹⁹ = 260565089 is a prime.

It is not a weakly prime, because it can be changed into another prime (261089327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130544688 + 130544689.

It is an arithmetic number, because the mean of its divisors is an integer number (130544689).

Almost surely, 2^261089377 is an apocalyptic number.

It is an amenable number.

261089377 is a deficient number, since it is larger than the sum of its proper divisors (1).

261089377 is an equidigital number, since it uses as much as digits as its factorization.

261089377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 261089377 is about 16158.2603333403. The cubic root of 261089377 is about 639.1405920877.

The spelling of 261089377 in words is "two hundred sixty-one million, eighty-nine thousand, three hundred seventy-seven".