261916073 has 2 divisors, whose sum is σ = 261916074. Its totient is φ = 261916072.

The previous prime is 261916051. The next prime is 261916079. The reversal of 261916073 is 370619162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259596544 + 2319529 = 16112^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 261916073 - 2⁶ = 261916009 is a prime.

It is not a weakly prime, because it can be changed into another prime (261916079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130958036 + 130958037.

It is an arithmetic number, because the mean of its divisors is an integer number (130958037).

Almost surely, 2^261916073 is an apocalyptic number.

It is an amenable number.

261916073 is a deficient number, since it is larger than the sum of its proper divisors (1).

261916073 is an equidigital number, since it uses as much as digits as its factorization.

261916073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 261916073 is about 16183.8213349011. The cubic root of 261916073 is about 639.8144587478.

The spelling of 261916073 in words is "two hundred sixty-one million, nine hundred sixteen thousand, seventy-three".