127500721 has 4 divisors (see below), whose sum is σ = 128008944. Its totient is φ = 126992500.

The previous prime is 127500689. The next prime is 127500727. The reversal of 127500721 is 127005721.

It is a happy number.

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: 127005721 = 61 ⋅2082061.

It is a cyclic number.

It is not a de Polignac number, because 127500721 - 2⁵ = 127500689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127500727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253735 + ... + 254236.

It is an arithmetic number, because the mean of its divisors is an integer number (32002236).

Almost surely, 2^127500721 is an apocalyptic number.

It is an amenable number.

127500721 is a deficient number, since it is larger than the sum of its proper divisors (508223).

127500721 is an equidigital number, since it uses as much as digits as its factorization.

127500721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508222.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 127500721 is about 11291.6217170077. The cubic root of 127500721 is about 503.3123035037.

The spelling of 127500721 in words is "one hundred twenty-seven million, five hundred thousand, seven hundred twenty-one".