1263129825 has 24 divisors (see below), whose sum is σ = 2096347968. Its totient is φ = 671097280.

The previous prime is 1263129821. The next prime is 1263129839. The reversal of 1263129825 is 5289213621.

It is not a de Polignac number, because 1263129825 - 2² = 1263129821 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1263129821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12294 + ... + 51743.

It is an arithmetic number, because the mean of its divisors is an integer number (87347832).

Almost surely, 2^1263129825 is an apocalyptic number.

1263129825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1263129825 is a deficient number, since it is larger than the sum of its proper divisors (833218143).

1263129825 is a wasteful number, since it uses less digits than its factorization.

1263129825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64313 (or 64308 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 1263129825 is about 35540.5377702702. The cubic root of 1263129825 is about 1080.9758626523.

The spelling of 1263129825 in words is "one billion, two hundred sixty-three million, one hundred twenty-nine thousand, eight hundred twenty-five".