261139383 has 10 divisors (see below), whose sum is σ = 390097224. Its totient is φ = 174092868.

The previous prime is 261139367. The next prime is 261139391. The reversal of 261139383 is 383931162.

261139383 is a `hidden beast` number, since 2 + 611 + 3 + 9 + 38 + 3 = 666.

It is not a de Polignac number, because 261139383 - 2⁴ = 261139367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261139183) 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 9 ways as a sum of consecutive naturals, for example, 1611891 + ... + 1612052.

Almost surely, 2^261139383 is an apocalyptic number.

261139383 is a deficient number, since it is larger than the sum of its proper divisors (128957841).

261139383 is an equidigital number, since it uses as much as digits as its factorization.

261139383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223955 (or 3223946 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 261139383 is about 16159.8076411819. The cubic root of 261139383 is about 639.1813939829.

The spelling of 261139383 in words is "two hundred sixty-one million, one hundred thirty-nine thousand, three hundred eighty-three".