1275481957 has 2 divisors, whose sum is σ = 1275481958. Its totient is φ = 1275481956.

The previous prime is 1275481891. The next prime is 1275482017. The reversal of 1275481957 is 7591845721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 794732481 + 480749476 = 28191^2 + 21926^2 .

It is an emirp because it is prime and its reverse (7591845721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1275481957 - 2⁷ = 1275481829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1275481957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1275481657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637740978 + 637740979.

It is an arithmetic number, because the mean of its divisors is an integer number (637740979).

Almost surely, 2^1275481957 is an apocalyptic number.

It is an amenable number.

1275481957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275481957 is an equidigital number, since it uses as much as digits as its factorization.

1275481957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 49.

The square root of 1275481957 is about 35713.8902529534. The cubic root of 1275481957 is about 1084.4880556793.

The spelling of 1275481957 in words is "one billion, two hundred seventy-five million, four hundred eighty-one thousand, nine hundred fifty-seven".