127538561 has 4 divisors (see below), whose sum is σ = 127723824. Its totient is φ = 127353300.

The previous prime is 127538533. The next prime is 127538569. The reversal of 127538561 is 165835721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165835721 = 443 ⋅374347.

It is a cyclic number.

It is not a de Polignac number, because 127538561 - 2⁶ = 127538497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127538569) 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, 91595 + ... + 92976.

It is an arithmetic number, because the mean of its divisors is an integer number (31930956).

Almost surely, 2^127538561 is an apocalyptic number.

It is an amenable number.

127538561 is a deficient number, since it is larger than the sum of its proper divisors (185263).

127538561 is an equidigital number, since it uses as much as digits as its factorization.

127538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185262.

The product of its digits is 50400, while the sum is 38.

The square root of 127538561 is about 11293.2971713313. The cubic root of 127538561 is about 503.3620900294.

The spelling of 127538561 in words is "one hundred twenty-seven million, five hundred thirty-eight thousand, five hundred sixty-one".