261080947 has 2 divisors, whose sum is σ = 261080948. Its totient is φ = 261080946.

The previous prime is 261080933. The next prime is 261080969. The reversal of 261080947 is 749080162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261080947 - 2⁷ = 261080819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261080147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130540473 + 130540474.

It is an arithmetic number, because the mean of its divisors is an integer number (130540474).

Almost surely, 2^261080947 is an apocalyptic number.

261080947 is a deficient number, since it is larger than the sum of its proper divisors (1).

261080947 is an equidigital number, since it uses as much as digits as its factorization.

261080947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 261080947 is about 16157.9994739448. Note that the first 3 decimals coincide. The cubic root of 261080947 is about 639.1337132004.

The spelling of 261080947 in words is "two hundred sixty-one million, eighty thousand, nine hundred forty-seven".