127997477 has 2 divisors, whose sum is σ = 127997478. Its totient is φ = 127997476.

The previous prime is 127997431. The next prime is 127997479. The reversal of 127997477 is 774799721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76143076 + 51854401 = 8726^2 + 7201^2 .

It is a cyclic number.

It is not a de Polignac number, because 127997477 - 2¹² = 127993381 is a prime.

Together with 127997479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127997479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63998738 + 63998739.

It is an arithmetic number, because the mean of its divisors is an integer number (63998739).

Almost surely, 2^127997477 is an apocalyptic number.

It is an amenable number.

127997477 is a deficient number, since it is larger than the sum of its proper divisors (1).

127997477 is an equidigital number, since it uses as much as digits as its factorization.

127997477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 53.

The square root of 127997477 is about 11313.5969965347. The cubic root of 127997477 is about 503.9651087062.

The spelling of 127997477 in words is "one hundred twenty-seven million, nine hundred ninety-seven thousand, four hundred seventy-seven".