1225555263 has 12 divisors (see below), whose sum is σ = 1770883608. Its totient is φ = 816742800.

The previous prime is 1225555259. The next prime is 1225555291. The reversal of 1225555263 is 3625555221.

1225555263 is a `hidden beast` number, since 122 + 5 + 5 + 5 + 526 + 3 = 666.

It is not a de Polignac number, because 1225555263 - 2² = 1225555259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225555213) 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, 3588 + ... + 49638.

It is an arithmetic number, because the mean of its divisors is an integer number (147573634).

Almost surely, 2^1225555263 is an apocalyptic number.

1225555263 is a deficient number, since it is larger than the sum of its proper divisors (545328345).

1225555263 is a wasteful number, since it uses less digits than its factorization.

1225555263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49014 (or 49011 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 1225555263 is about 35007.9314298917. The cubic root of 1225555263 is about 1070.1491226640.

The spelling of 1225555263 in words is "one billion, two hundred twenty-five million, five hundred fifty-five thousand, two hundred sixty-three".