1271420977 has 2 divisors, whose sum is σ = 1271420978. Its totient is φ = 1271420976.

The previous prime is 1271420963. The next prime is 1271420989. The reversal of 1271420977 is 7790241721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1232782321 + 38638656 = 35111^2 + 6216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271420977 - 2⁷ = 1271420849 is a prime.

It is a super-2 number, since 2×1271420977² = 3233022601511269058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1271420957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635710488 + 635710489.

It is an arithmetic number, because the mean of its divisors is an integer number (635710489).

Almost surely, 2^1271420977 is an apocalyptic number.

It is an amenable number.

1271420977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271420977 is an equidigital number, since it uses as much as digits as its factorization.

1271420977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 1271420977 is about 35656.9905768841. The cubic root of 1271420977 is about 1083.3358724885.

The spelling of 1271420977 in words is "one billion, two hundred seventy-one million, four hundred twenty thousand, nine hundred seventy-seven".