1275799957 has 2 divisors, whose sum is σ = 1275799958. Its totient is φ = 1275799956.

The previous prime is 1275799937. The next prime is 1275799999. The reversal of 1275799957 is 7599975721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 989039601 + 286760356 = 31449^2 + 16934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275799957 - 2¹¹ = 1275797909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1275799895 and 1275799904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1275799907) 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, 637899978 + 637899979.

It is an arithmetic number, because the mean of its divisors is an integer number (637899979).

Almost surely, 2^1275799957 is an apocalyptic number.

It is an amenable number.

1275799957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275799957 is an equidigital number, since it uses as much as digits as its factorization.

1275799957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12502350, while the sum is 61.

The square root of 1275799957 is about 35718.3420247917. The cubic root of 1275799957 is about 1084.5781754815.

The spelling of 1275799957 in words is "one billion, two hundred seventy-five million, seven hundred ninety-nine thousand, nine hundred fifty-seven".