127656013 has 4 divisors (see below), whose sum is σ = 128185948. Its totient is φ = 127126080.

The previous prime is 127655989. The next prime is 127656017. The reversal of 127656013 is 310656721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310656721 = 947 ⋅328043.

It can be written as a sum of positive squares in 2 ways, for example, as 48748324 + 78907689 = 6982^2 + 8883^2 .

It is a cyclic number.

It is not a de Polignac number, because 127656013 - 2⁹ = 127655501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127656017) 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, 264606 + ... + 265087.

It is an arithmetic number, because the mean of its divisors is an integer number (32046487).

Almost surely, 2^127656013 is an apocalyptic number.

It is an amenable number.

127656013 is a deficient number, since it is larger than the sum of its proper divisors (529935).

127656013 is an equidigital number, since it uses as much as digits as its factorization.

127656013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529934.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 127656013 is about 11298.4960503600. The cubic root of 127656013 is about 503.5165602921.

The spelling of 127656013 in words is "one hundred twenty-seven million, six hundred fifty-six thousand, thirteen".