127319977 has 4 divisors (see below), whose sum is σ = 127979860. Its totient is φ = 126660096.

The previous prime is 127319971. The next prime is 127319989. The reversal of 127319977 is 779913721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779913721 = 277 ⋅2815573.

It can be written as a sum of positive squares in 2 ways, for example, as 79281216 + 48038761 = 8904^2 + 6931^2 .

It is a cyclic number.

It is not a de Polignac number, because 127319977 - 2²³ = 118931369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127319971) 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, 329652 + ... + 330037.

It is an arithmetic number, because the mean of its divisors is an integer number (31994965).

Almost surely, 2^127319977 is an apocalyptic number.

It is an amenable number.

127319977 is a deficient number, since it is larger than the sum of its proper divisors (659883).

127319977 is an equidigital number, since it uses as much as digits as its factorization.

127319977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659882.

The product of its digits is 166698, while the sum is 46.

The square root of 127319977 is about 11283.6154223724. The cubic root of 127319977 is about 503.0743605374.

The spelling of 127319977 in words is "one hundred twenty-seven million, three hundred nineteen thousand, nine hundred seventy-seven".