126571 has 4 divisors (see below), whose sum is σ = 129312. Its totient is φ = 123832.

The previous prime is 126551. The next prime is 126583. The reversal of 126571 is 175621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126571 - 2⁷ = 126443 is a prime.

It is a Duffinian number.

126571 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (126541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300 + ... + 1393.

It is an arithmetic number, because the mean of its divisors is an integer number (32328).

2¹²⁶⁵⁷¹ is an apocalyptic number.

126571 is a deficient number, since it is larger than the sum of its proper divisors (2741).

126571 is an equidigital number, since it uses as much as digits as its factorization.

126571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740.

The product of its digits is 420, while the sum is 22.

The square root of 126571 is about 355.7681829506. The cubic root of 126571 is about 50.2085952172.

The spelling of 126571 in words is "one hundred twenty-six thousand, five hundred seventy-one".