127791089 has 2 divisors, whose sum is σ = 127791090. Its totient is φ = 127791088.

The previous prime is 127791061. The next prime is 127791101. The reversal of 127791089 is 980197721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86638864 + 41152225 = 9308^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 127791089 - 2¹² = 127786993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127791019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63895544 + 63895545.

It is an arithmetic number, because the mean of its divisors is an integer number (63895545).

Almost surely, 2^127791089 is an apocalyptic number.

It is an amenable number.

127791089 is a deficient number, since it is larger than the sum of its proper divisors (1).

127791089 is an equidigital number, since it uses as much as digits as its factorization.

127791089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 127791089 is about 11304.4720796683. The cubic root of 127791089 is about 503.6940921520.

The spelling of 127791089 in words is "one hundred twenty-seven million, seven hundred ninety-one thousand, eighty-nine".