1263644925 has 12 divisors (see below), whose sum is σ = 2089226400. Its totient is φ = 673943920.

The previous prime is 1263644897. The next prime is 1263644929. The reversal of 1263644925 is 5294463621.

It is not a de Polignac number, because 1263644925 - 2⁶ = 1263644861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263644929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8424225 + ... + 8424374.

It is an arithmetic number, because the mean of its divisors is an integer number (174102200).

Almost surely, 2^1263644925 is an apocalyptic number.

1263644925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1263644925 is a deficient number, since it is larger than the sum of its proper divisors (825581475).

1263644925 is a wasteful number, since it uses less digits than its factorization.

1263644925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16848612 (or 16848607 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The square root of 1263644925 is about 35547.7836861878. The cubic root of 1263644925 is about 1081.1227820965.

The spelling of 1263644925 in words is "one billion, two hundred sixty-three million, six hundred forty-four thousand, nine hundred twenty-five".