1295507557 has 2 divisors, whose sum is σ = 1295507558. Its totient is φ = 1295507556.

The previous prime is 1295507513. The next prime is 1295507579. The reversal of 1295507557 is 7557055921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998496801 + 297010756 = 31599^2 + 17234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1295507557 - 2²³ = 1287118949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1295502557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647753778 + 647753779.

It is an arithmetic number, because the mean of its divisors is an integer number (647753779).

Almost surely, 2^1295507557 is an apocalyptic number.

It is an amenable number.

1295507557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295507557 is an equidigital number, since it uses as much as digits as its factorization.

1295507557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551250, while the sum is 46.

The square root of 1295507557 is about 35993.1598640631. The cubic root of 1295507557 is about 1090.1342474159.

The spelling of 1295507557 in words is "one billion, two hundred ninety-five million, five hundred seven thousand, five hundred fifty-seven".