1263131265 has 16 divisors (see below), whose sum is σ = 2204738496. Its totient is φ = 612427200.

The previous prime is 1263131257. The next prime is 1263131281. The reversal of 1263131265 is 5621313621.

It is not a de Polignac number, because 1263131265 - 2³ = 1263131257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3827506 + ... + 3827835.

It is an arithmetic number, because the mean of its divisors is an integer number (137796156).

Almost surely, 2^1263131265 is an apocalyptic number.

1263131265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1263131265 is a deficient number, since it is larger than the sum of its proper divisors (941607231).

1263131265 is a wasteful number, since it uses less digits than its factorization.

1263131265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655360.

The product of its digits is 6480, while the sum is 30.

The square root of 1263131265 is about 35540.5580288211. The cubic root of 1263131265 is about 1080.9762734321.

Adding to 1263131265 its reverse (5621313621), we get a palindrome (6884444886).

The spelling of 1263131265 in words is "one billion, two hundred sixty-three million, one hundred thirty-one thousand, two hundred sixty-five".