261028871 has 2 divisors, whose sum is σ = 261028872. Its totient is φ = 261028870.

The previous prime is 261028793. The next prime is 261028879. The reversal of 261028871 is 178820162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261028871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261028879) 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 as a sum of consecutive naturals, namely, 130514435 + 130514436.

It is an arithmetic number, because the mean of its divisors is an integer number (130514436).

Almost surely, 2^261028871 is an apocalyptic number.

261028871 is a deficient number, since it is larger than the sum of its proper divisors (1).

261028871 is an equidigital number, since it uses as much as digits as its factorization.

261028871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 261028871 is about 16156.3879317130. The cubic root of 261028871 is about 639.0912158564.

The spelling of 261028871 in words is "two hundred sixty-one million, twenty-eight thousand, eight hundred seventy-one".