127712561 has 4 divisors (see below), whose sum is σ = 127745124. Its totient is φ = 127680000.

The previous prime is 127712513. The next prime is 127712569. The reversal of 127712561 is 165217721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165217721 = 1721 ⋅96001.

It can be written as a sum of positive squares in 2 ways, for example, as 65302561 + 62410000 = 8081^2 + 7900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127712561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127712569) 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, 9440 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (31936281).

Almost surely, 2^127712561 is an apocalyptic number.

It is an amenable number.

127712561 is a deficient number, since it is larger than the sum of its proper divisors (32563).

127712561 is an equidigital number, since it uses as much as digits as its factorization.

127712561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32562.

The product of its digits is 5880, while the sum is 32.

The square root of 127712561 is about 11300.9982302450. The cubic root of 127712561 is about 503.5908971776.

The spelling of 127712561 in words is "one hundred twenty-seven million, seven hundred twelve thousand, five hundred sixty-one".