261740873 has 2 divisors, whose sum is σ = 261740874. Its totient is φ = 261740872.

The previous prime is 261740867. The next prime is 261740881. The reversal of 261740873 is 378047162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261048649 + 692224 = 16157^2 + 832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261740873 is a prime.

It is not a weakly prime, because it can be changed into another prime (261740803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130870436 + 130870437.

It is an arithmetic number, because the mean of its divisors is an integer number (130870437).

Almost surely, 2^261740873 is an apocalyptic number.

It is an amenable number.

261740873 is a deficient number, since it is larger than the sum of its proper divisors (1).

261740873 is an equidigital number, since it uses as much as digits as its factorization.

261740873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 261740873 is about 16178.4076163262. The cubic root of 261740873 is about 639.6717660965.

The spelling of 261740873 in words is "two hundred sixty-one million, seven hundred forty thousand, eight hundred seventy-three".