127545721 has 2 divisors, whose sum is σ = 127545722. Its totient is φ = 127545720.

The previous prime is 127545703. The next prime is 127545731.

127545721 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124434025 + 3111696 = 11155^2 + 1764^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 127545721 - 2²¹ = 125448569 is a prime.

It is not a weakly prime, because it can be changed into another prime (127545731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63772860 + 63772861.

It is an arithmetic number, because the mean of its divisors is an integer number (63772861).

Almost surely, 2^127545721 is an apocalyptic number.

It is an amenable number.

127545721 is a deficient number, since it is larger than the sum of its proper divisors (1).

127545721 is an equidigital number, since it uses as much as digits as its factorization.

127545721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19600, while the sum is 34.

The square root of 127545721 is about 11293.6141690780. The cubic root of 127545721 is about 503.3715094162.

The spelling of 127545721 in words is "one hundred twenty-seven million, five hundred forty-five thousand, seven hundred twenty-one".