261712057 has 2 divisors, whose sum is σ = 261712058. Its totient is φ = 261712056.

The previous prime is 261712043. The next prime is 261712067. The reversal of 261712057 is 750217162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172239376 + 89472681 = 13124^2 + 9459^2 .

It is a cyclic number.

It is not a de Polignac number, because 261712057 - 2¹⁵ = 261679289 is a prime.

It is not a weakly prime, because it can be changed into another prime (261712067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130856028 + 130856029.

It is an arithmetic number, because the mean of its divisors is an integer number (130856029).

Almost surely, 2^261712057 is an apocalyptic number.

It is an amenable number.

261712057 is a deficient number, since it is larger than the sum of its proper divisors (1).

261712057 is an equidigital number, since it uses as much as digits as its factorization.

261712057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 261712057 is about 16177.5170220896. The cubic root of 261712057 is about 639.6482906417.

The spelling of 261712057 in words is "two hundred sixty-one million, seven hundred twelve thousand, fifty-seven".