127242091 has 4 divisors (see below), whose sum is σ = 127431832. Its totient is φ = 127052352.

The previous prime is 127242083. The next prime is 127242097. The reversal of 127242091 is 190242721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190242721 = 137 ⋅1388633.

It is a cyclic number.

It is not a de Polignac number, because 127242091 - 2³ = 127242083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127242097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93861 + ... + 95206.

It is an arithmetic number, because the mean of its divisors is an integer number (31857958).

Almost surely, 2^127242091 is an apocalyptic number.

127242091 is a deficient number, since it is larger than the sum of its proper divisors (189741).

127242091 is an equidigital number, since it uses as much as digits as its factorization.

127242091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189740.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 127242091 is about 11280.1636069695. The cubic root of 127242091 is about 502.9717569946.

The spelling of 127242091 in words is "one hundred twenty-seven million, two hundred forty-two thousand, ninety-one".