127172321 has 2 divisors, whose sum is σ = 127172322. Its totient is φ = 127172320.

The previous prime is 127172303. The next prime is 127172327. The reversal of 127172321 is 123271721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98227921 + 28944400 = 9911^2 + 5380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127172321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127172327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63586160 + 63586161.

It is an arithmetic number, because the mean of its divisors is an integer number (63586161).

Almost surely, 2^127172321 is an apocalyptic number.

It is an amenable number.

127172321 is a deficient number, since it is larger than the sum of its proper divisors (1).

127172321 is an equidigital number, since it uses as much as digits as its factorization.

127172321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 127172321 is about 11277.0705859279. The cubic root of 127172321 is about 502.8798095497.

The spelling of 127172321 in words is "one hundred twenty-seven million, one hundred seventy-two thousand, three hundred twenty-one".