1271972477 has 2 divisors, whose sum is σ = 1271972478. Its totient is φ = 1271972476.

The previous prime is 1271972431. The next prime is 1271972489. The reversal of 1271972477 is 7742791721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 960132196 + 311840281 = 30986^2 + 17659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271972477 - 2¹⁴ = 1271956093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271972417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635986238 + 635986239.

It is an arithmetic number, because the mean of its divisors is an integer number (635986239).

Almost surely, 2^1271972477 is an apocalyptic number.

It is an amenable number.

1271972477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271972477 is an equidigital number, since it uses as much as digits as its factorization.

1271972477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345744, while the sum is 47.

The square root of 1271972477 is about 35664.7231448668. The cubic root of 1271972477 is about 1083.4924881647.

The spelling of 1271972477 in words is "one billion, two hundred seventy-one million, nine hundred seventy-two thousand, four hundred seventy-seven".