127139917 has 2 divisors, whose sum is σ = 127139918. Its totient is φ = 127139916.

The previous prime is 127139899. The next prime is 127139927. The reversal of 127139917 is 719931721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112593321 + 14546596 = 10611^2 + 3814^2 .

It is a cyclic number.

It is not a de Polignac number, because 127139917 - 2²³ = 118751309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127139917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127139927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63569958 + 63569959.

It is an arithmetic number, because the mean of its divisors is an integer number (63569959).

Almost surely, 2^127139917 is an apocalyptic number.

It is an amenable number.

127139917 is a deficient number, since it is larger than the sum of its proper divisors (1).

127139917 is an equidigital number, since it uses as much as digits as its factorization.

127139917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 40.

The square root of 127139917 is about 11275.6337737619. The cubic root of 127139917 is about 502.8370940137.

The spelling of 127139917 in words is "one hundred twenty-seven million, one hundred thirty-nine thousand, nine hundred seventeen".