1263132257 has 4 divisors (see below), whose sum is σ = 1263544260. Its totient is φ = 1262720256.

The previous prime is 1263132251. The next prime is 1263132259. The reversal of 1263132257 is 7522313621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1062173281 + 200958976 = 32591^2 + 14176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263132257 - 2³⁰ = 189390433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263132251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201368 + ... + 207545.

It is an arithmetic number, because the mean of its divisors is an integer number (315886065).

Almost surely, 2^1263132257 is an apocalyptic number.

It is an amenable number.

1263132257 is a deficient number, since it is larger than the sum of its proper divisors (412003).

1263132257 is an equidigital number, since it uses as much as digits as its factorization.

1263132257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412002.

The product of its digits is 15120, while the sum is 32.

The square root of 1263132257 is about 35540.5719847050. The cubic root of 1263132257 is about 1080.9765564136.

Adding to 1263132257 its reverse (7522313621), we get a palindrome (8785445878).

The spelling of 1263132257 in words is "one billion, two hundred sixty-three million, one hundred thirty-two thousand, two hundred fifty-seven".