271642561 has 2 divisors, whose sum is σ = 271642562. Its totient is φ = 271642560.

The previous prime is 271642537. The next prime is 271642573. The reversal of 271642561 is 165246172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176384961 + 95257600 = 13281^2 + 9760^2 .

It is a cyclic number.

It is not a de Polignac number, because 271642561 - 2²⁵ = 238088129 is a prime.

It is not a weakly prime, because it can be changed into another prime (271642661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135821280 + 135821281.

It is an arithmetic number, because the mean of its divisors is an integer number (135821281).

Almost surely, 2^271642561 is an apocalyptic number.

It is an amenable number.

271642561 is a deficient number, since it is larger than the sum of its proper divisors (1).

271642561 is an equidigital number, since it uses as much as digits as its factorization.

271642561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 271642561 is about 16481.5824786335. The cubic root of 271642561 is about 647.6384212346.

The spelling of 271642561 in words is "two hundred seventy-one million, six hundred forty-two thousand, five hundred sixty-one".