127172729 has 2 divisors, whose sum is σ = 127172730. Its totient is φ = 127172728.

The previous prime is 127172713. The next prime is 127172777. The reversal of 127172729 is 927271721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124367104 + 2805625 = 11152^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 127172729 - 2⁴ = 127172713 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 127172692 and 127172701.

It is not a weakly prime, because it can be changed into another prime (127172779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63586364 + 63586365.

It is an arithmetic number, because the mean of its divisors is an integer number (63586365).

Almost surely, 2^127172729 is an apocalyptic number.

It is an amenable number.

127172729 is a deficient number, since it is larger than the sum of its proper divisors (1).

127172729 is an equidigital number, since it uses as much as digits as its factorization.

127172729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 38.

The square root of 127172729 is about 11277.0886757177. The cubic root of 127172729 is about 502.8803473364.

The spelling of 127172729 in words is "one hundred twenty-seven million, one hundred seventy-two thousand, seven hundred twenty-nine".