263561138 has 32 divisors (see below), whose sum is σ = 414485760. Its totient is φ = 125582400.

The previous prime is 263561093. The next prime is 263561153. The reversal of 263561138 is 831165362.

It is a junction number, because it is equal to n+sod(n) for n = 263561098 and 263561107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1150808 + ... + 1151036.

It is an arithmetic number, because the mean of its divisors is an integer number (12952680).

Almost surely, 2^263561138 is an apocalyptic number.

263561138 is a deficient number, since it is larger than the sum of its proper divisors (150924622).

263561138 is a wasteful number, since it uses less digits than its factorization.

263561138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 25920, while the sum is 35.

The square root of 263561138 is about 16234.5661475754. The cubic root of 263561138 is about 641.1511979018.

The spelling of 263561138 in words is "two hundred sixty-three million, five hundred sixty-one thousand, one hundred thirty-eight".