127740751 has 4 divisors (see below), whose sum is σ = 127771504. Its totient is φ = 127710000.

The previous prime is 127740749. The next prime is 127740757. The reversal of 127740751 is 157047721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157047721 = 37 ⋅4244533.

It is a cyclic number.

It is not a de Polignac number, because 127740751 - 2¹ = 127740749 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 (127740757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7950 + ... + 17851.

It is an arithmetic number, because the mean of its divisors is an integer number (31942876).

Almost surely, 2^127740751 is an apocalyptic number.

127740751 is a deficient number, since it is larger than the sum of its proper divisors (30753).

127740751 is an equidigital number, since it uses as much as digits as its factorization.

127740751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30752.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 127740751 is about 11302.2453963803. The cubic root of 127740751 is about 503.6279469998.

The spelling of 127740751 in words is "one hundred twenty-seven million, seven hundred forty thousand, seven hundred fifty-one".