271687981 has 2 divisors, whose sum is σ = 271687982. Its totient is φ = 271687980.

The previous prime is 271687919. The next prime is 271687987. The reversal of 271687981 is 189786172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182007081 + 89680900 = 13491^2 + 9470^2 .

It is a cyclic number.

It is not a de Polignac number, because 271687981 - 2²³ = 263299373 is a prime.

It is a super-2 number, since 2×271687981² = 147628718039712722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (271687987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135843990 + 135843991.

It is an arithmetic number, because the mean of its divisors is an integer number (135843991).

Almost surely, 2^271687981 is an apocalyptic number.

It is an amenable number.

271687981 is a deficient number, since it is larger than the sum of its proper divisors (1).

271687981 is an equidigital number, since it uses as much as digits as its factorization.

271687981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 49.

The square root of 271687981 is about 16482.9603227090. The cubic root of 271687981 is about 647.6745153548.

The spelling of 271687981 in words is "two hundred seventy-one million, six hundred eighty-seven thousand, nine hundred eighty-one".