127978577 has 2 divisors, whose sum is σ = 127978578. Its totient is φ = 127978576.

The previous prime is 127978573. The next prime is 127978619. The reversal of 127978577 is 775879721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107827456 + 20151121 = 10384^2 + 4489^2 .

It is an emirp because it is prime and its reverse (775879721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127978577 - 2² = 127978573 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127978573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63989288 + 63989289.

It is an arithmetic number, because the mean of its divisors is an integer number (63989289).

Almost surely, 2^127978577 is an apocalyptic number.

It is an amenable number.

127978577 is a deficient number, since it is larger than the sum of its proper divisors (1).

127978577 is an equidigital number, since it uses as much as digits as its factorization.

127978577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728720, while the sum is 53.

The square root of 127978577 is about 11312.7616875810. The cubic root of 127978577 is about 503.9403024636.

The spelling of 127978577 in words is "one hundred twenty-seven million, nine hundred seventy-eight thousand, five hundred seventy-seven".