260678921 has 2 divisors, whose sum is σ = 260678922. Its totient is φ = 260678920.

The previous prime is 260678911. The next prime is 260678959. The reversal of 260678921 is 129876062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260467321 + 211600 = 16139^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 260678921 - 2¹⁸ = 260416777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (260678911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130339460 + 130339461.

It is an arithmetic number, because the mean of its divisors is an integer number (130339461).

Almost surely, 2^260678921 is an apocalyptic number.

It is an amenable number.

260678921 is a deficient number, since it is larger than the sum of its proper divisors (1).

260678921 is an equidigital number, since it uses as much as digits as its factorization.

260678921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 260678921 is about 16145.5542178025. The cubic root of 260678921 is about 638.8054875760.

The spelling of 260678921 in words is "two hundred sixty million, six hundred seventy-eight thousand, nine hundred twenty-one".