261327677 has 4 divisors (see below), whose sum is σ = 281429820. Its totient is φ = 241225536.

The previous prime is 261327667. The next prime is 261327709. The reversal of 261327677 is 776723162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25060036 + 236267641 = 5006^2 + 15371^2 .

It is a cyclic number.

It is not a de Polignac number, because 261327677 - 2²⁴ = 244550461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261327607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10051052 + ... + 10051077.

It is an arithmetic number, because the mean of its divisors is an integer number (70357455).

Almost surely, 2^261327677 is an apocalyptic number.

It is an amenable number.

261327677 is a deficient number, since it is larger than the sum of its proper divisors (20102143).

261327677 is a wasteful number, since it uses less digits than its factorization.

261327677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20102142.

The product of its digits is 148176, while the sum is 41.

The square root of 261327677 is about 16165.6325889215. The cubic root of 261327677 is about 639.3349838712.

The spelling of 261327677 in words is "two hundred sixty-one million, three hundred twenty-seven thousand, six hundred seventy-seven".