261634727 has 2 divisors, whose sum is σ = 261634728. Its totient is φ = 261634726.

The previous prime is 261634717. The next prime is 261634783. The reversal of 261634727 is 727436162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261634727 - 2¹⁸ = 261372583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261634717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130817363 + 130817364.

It is an arithmetic number, because the mean of its divisors is an integer number (130817364).

Almost surely, 2^261634727 is an apocalyptic number.

261634727 is a deficient number, since it is larger than the sum of its proper divisors (1).

261634727 is an equidigital number, since it uses as much as digits as its factorization.

261634727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 38.

The square root of 261634727 is about 16175.1268001212. The cubic root of 261634727 is about 639.5852838961.

The spelling of 261634727 in words is "two hundred sixty-one million, six hundred thirty-four thousand, seven hundred twenty-seven".