127090721 has 2 divisors, whose sum is σ = 127090722. Its totient is φ = 127090720.

The previous prime is 127090703. The next prime is 127090729.

127090721 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., 85359121 + 41731600 = 9239^2 + 6460^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127090721 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (127090729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63545360 + 63545361.

It is an arithmetic number, because the mean of its divisors is an integer number (63545361).

Almost surely, 2^127090721 is an apocalyptic number.

It is an amenable number.

127090721 is a deficient number, since it is larger than the sum of its proper divisors (1).

127090721 is an equidigital number, since it uses as much as digits as its factorization.

127090721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 127090721 is about 11273.4520445159. The cubic root of 127090721 is about 502.7722290848.

The spelling of 127090721 in words is "one hundred twenty-seven million, ninety thousand, seven hundred twenty-one".