127981099 has 4 divisors (see below), whose sum is σ = 128319160. Its totient is φ = 127643040.

The previous prime is 127981097. The next prime is 127981109. The reversal of 127981099 is 990189721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990189721 = 23 ⋅43051727.

It is a cyclic number.

It is not a de Polignac number, because 127981099 - 2¹ = 127981097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127981097) 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, 168462 + ... + 169219.

It is an arithmetic number, because the mean of its divisors is an integer number (32079790).

Almost surely, 2^127981099 is an apocalyptic number.

127981099 is a deficient number, since it is larger than the sum of its proper divisors (338061).

127981099 is an equidigital number, since it uses as much as digits as its factorization.

127981099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338060.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 127981099 is about 11312.8731540666. The cubic root of 127981099 is about 503.9436127288.

The spelling of 127981099 in words is "one hundred twenty-seven million, nine hundred eighty-one thousand, ninety-nine".