127779797 has 2 divisors, whose sum is σ = 127779798. Its totient is φ = 127779796.

The previous prime is 127779733. The next prime is 127779809. The reversal of 127779797 is 797977721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119990116 + 7789681 = 10954^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 127779797 - 2⁶ = 127779733 is a prime.

It is a super-2 number, since 2×127779797² = 32655353042722418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127779727) 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 as a sum of consecutive naturals, namely, 63889898 + 63889899.

It is an arithmetic number, because the mean of its divisors is an integer number (63889899).

Almost surely, 2^127779797 is an apocalyptic number.

It is an amenable number.

127779797 is a deficient number, since it is larger than the sum of its proper divisors (1).

127779797 is an equidigital number, since it uses as much as digits as its factorization.

127779797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2722734, while the sum is 56.

The square root of 127779797 is about 11303.9726202782. The cubic root of 127779797 is about 503.6792557466.

The spelling of 127779797 in words is "one hundred twenty-seven million, seven hundred seventy-nine thousand, seven hundred ninety-seven".