127561 has 4 divisors (see below), whose sum is σ = 145792. Its totient is φ = 109332.

The previous prime is 127549. The next prime is 127579. The reversal of 127561 is 165721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 127561 - 2⁵ = 127529 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127541) 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, 9105 + ... + 9118.

It is an arithmetic number, because the mean of its divisors is an integer number (36448).

2¹²⁷⁵⁶¹ is an apocalyptic number.

It is an amenable number.

127561 is a deficient number, since it is larger than the sum of its proper divisors (18231).

127561 is an equidigital number, since it uses as much as digits as its factorization.

127561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18230.

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

The square root of 127561 is about 357.1568282982. The cubic root of 127561 is about 50.3391608630.

The spelling of 127561 in words is "one hundred twenty-seven thousand, five hundred sixty-one".