127640091 has 4 divisors (see below), whose sum is σ = 170186792. Its totient is φ = 85093392.

The previous prime is 127640077. The next prime is 127640099. The reversal of 127640091 is 190046721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 127640091 - 2⁶ = 127640027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127640099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21273346 + ... + 21273351.

It is an arithmetic number, because the mean of its divisors is an integer number (42546698).

Almost surely, 2^127640091 is an apocalyptic number.

127640091 is a deficient number, since it is larger than the sum of its proper divisors (42546701).

127640091 is an equidigital number, since it uses as much as digits as its factorization.

127640091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42546700.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 127640091 is about 11297.7914213354. The cubic root of 127640091 is about 503.4956255843.

The spelling of 127640091 in words is "one hundred twenty-seven million, six hundred forty thousand, ninety-one".