261065803 has 2 divisors, whose sum is σ = 261065804. Its totient is φ = 261065802.

The previous prime is 261065789. The next prime is 261065807. The reversal of 261065803 is 308560162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261065803 - 2¹⁷ = 260934731 is a prime.

It is not a weakly prime, because it can be changed into another prime (261065807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130532901 + 130532902.

It is an arithmetic number, because the mean of its divisors is an integer number (130532902).

Almost surely, 2^261065803 is an apocalyptic number.

261065803 is a deficient number, since it is larger than the sum of its proper divisors (1).

261065803 is an equidigital number, since it uses as much as digits as its factorization.

261065803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 261065803 is about 16157.5308447795. The cubic root of 261065803 is about 639.1213553114.

The spelling of 261065803 in words is "two hundred sixty-one million, sixty-five thousand, eight hundred three".