1275774257 has 2 divisors, whose sum is σ = 1275774258. Its totient is φ = 1275774256.

The previous prime is 1275774193. The next prime is 1275774317. The reversal of 1275774257 is 7524775721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244960656 + 30813601 = 35284^2 + 5551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275774257 - 2⁶ = 1275774193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1275774457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637887128 + 637887129.

It is an arithmetic number, because the mean of its divisors is an integer number (637887129).

Almost surely, 2^1275774257 is an apocalyptic number.

It is an amenable number.

1275774257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275774257 is an equidigital number, since it uses as much as digits as its factorization.

1275774257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960400, while the sum is 47.

The square root of 1275774257 is about 35717.9822638402. The cubic root of 1275774257 is about 1084.5708927707.

The spelling of 1275774257 in words is "one billion, two hundred seventy-five million, seven hundred seventy-four thousand, two hundred fifty-seven".