Search a number
127881 = 32131093
BaseRepresentation
bin11111001110001001
320111102100
4133032021
513043011
62424013
71041555
oct371611
9214370
10127881
1188096
1262009
1346290
1434865
1527d56
hex1f389

127881 has 12 divisors (see below), whose sum is σ = 199108. Its totient is φ = 78624.

The previous prime is 127877. The next prime is 127913. The reversal of 127881 is 188721.

It can be written as a sum of positive squares in 2 ways, for example, as 81225 + 46656 = 285^2 + 216^2 .

It is a Wieferich number.

It is not a de Polignac number, because 127881 - 22 = 127877 is a prime.

It is a super-2 number, since 2×1278812 = 32707100322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 127881.

It is not an unprimeable number, because it can be changed into a prime (127081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430 + ... + 663.

2127881 is an apocalyptic number.

It is an amenable number.

127881 is a deficient number, since it is larger than the sum of its proper divisors (71227).

127881 is a wasteful number, since it uses less digits than its factorization.

127881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112 (or 1109 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 127881 is about 357.6045301726. The cubic root of 127881 is about 50.3812193821.

The spelling of 127881 in words is "one hundred twenty-seven thousand, eight hundred eighty-one".