1263324855 has 48 divisors (see below), whose sum is σ = 2248089120. Its totient is φ = 605090304.

The previous prime is 1263324847. The next prime is 1263324857. The reversal of 1263324855 is 5584233621.

It is a happy number.

It is not a de Polignac number, because 1263324855 - 2³ = 1263324847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263324857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87061 + ... + 100529.

It is an arithmetic number, because the mean of its divisors is an integer number (46835190).

Almost surely, 2^1263324855 is an apocalyptic number.

1263324855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1263324855 is a deficient number, since it is larger than the sum of its proper divisors (984764265).

1263324855 is a wasteful number, since it uses less digits than its factorization.

1263324855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13540 (or 13527 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 1263324855 is about 35543.2814326421. The cubic root of 1263324855 is about 1081.0314947995.

The spelling of 1263324855 in words is "one billion, two hundred sixty-three million, three hundred twenty-four thousand, eight hundred fifty-five".