127974109 has 2 divisors, whose sum is σ = 127974110. Its totient is φ = 127974108.

The previous prime is 127974097. The next prime is 127974151. The reversal of 127974109 is 901479721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79602084 + 48372025 = 8922^2 + 6955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127974109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127974179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63987054 + 63987055.

It is an arithmetic number, because the mean of its divisors is an integer number (63987055).

Almost surely, 2^127974109 is an apocalyptic number.

It is an amenable number.

127974109 is a deficient number, since it is larger than the sum of its proper divisors (1).

127974109 is an equidigital number, since it uses as much as digits as its factorization.

127974109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 127974109 is about 11312.5642097625. The cubic root of 127974109 is about 503.9344378584.

The spelling of 127974109 in words is "one hundred twenty-seven million, nine hundred seventy-four thousand, one hundred nine".