1138806261 has 6 divisors (see below), whose sum is σ = 1644942390. Its totient is φ = 759204168.

The previous prime is 1138806257. The next prime is 1138806269. The reversal of 1138806261 is 1626088311.

1138806261 is a `hidden beast` number, since 11 + 388 + 0 + 6 + 261 = 666.

It can be written as a sum of positive squares in only one way, i.e., 899640036 + 239166225 = 29994^2 + 15465^2 .

It is not a de Polignac number, because 1138806261 - 2² = 1138806257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138806269) 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 5 ways as a sum of consecutive naturals, for example, 63267006 + ... + 63267023.

It is an arithmetic number, because the mean of its divisors is an integer number (274157065).

Almost surely, 2^1138806261 is an apocalyptic number.

It is an amenable number.

1138806261 is a deficient number, since it is larger than the sum of its proper divisors (506136129).

1138806261 is a wasteful number, since it uses less digits than its factorization.

1138806261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126534035 (or 126534032 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1138806261 is about 33746.2036531519. The cubic root of 1138806261 is about 1044.2791701784.

The spelling of 1138806261 in words is "one billion, one hundred thirty-eight million, eight hundred six thousand, two hundred sixty-one".