261827371 has 4 divisors (see below), whose sum is σ = 281967952. Its totient is φ = 241686792.

The previous prime is 261827351. The next prime is 261827383. The reversal of 261827371 is 173728162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 173728162 = 2 ⋅86864081.

It is a cyclic number.

It is not a de Polignac number, because 261827371 - 2¹⁹ = 261303083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261827371.

It is not an unprimeable number, because it can be changed into a prime (261827351) 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, 10070271 + ... + 10070296.

It is an arithmetic number, because the mean of its divisors is an integer number (70491988).

Almost surely, 2^261827371 is an apocalyptic number.

261827371 is a deficient number, since it is larger than the sum of its proper divisors (20140581).

261827371 is a wasteful number, since it uses less digits than its factorization.

261827371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20140580.

The product of its digits is 28224, while the sum is 37.

The square root of 261827371 is about 16181.0806499442. The cubic root of 261827371 is about 639.7422228474.

The spelling of 261827371 in words is "two hundred sixty-one million, eight hundred twenty-seven thousand, three hundred seventy-one".