261490612239 has 12 divisors (see below), whose sum is σ = 377727622272. Its totient is φ = 174318324000.

The previous prime is 261490612193. The next prime is 261490612249. The reversal of 261490612239 is 932216094162.

261490612239 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 9 + 0 + 612 + 23 + 9 = 666.

It is not a de Polignac number, because 261490612239 - 2⁹ = 261490611727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261490612194 and 261490612203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261490612249) 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, 537327 + ... + 900944.

It is an arithmetic number, because the mean of its divisors is an integer number (31477301856).

Almost surely, 2^261490612239 is an apocalyptic number.

261490612239 is a deficient number, since it is larger than the sum of its proper divisors (116237010033).

261490612239 is a wasteful number, since it uses less digits than its factorization.

261490612239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458478 (or 1458475 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 261490612239 in words is "two hundred sixty-one billion, four hundred ninety million, six hundred twelve thousand, two hundred thirty-nine".