261138675 has 48 divisors (see below), whose sum is σ = 497325312. Its totient is φ = 118435200.

The previous prime is 261138671. The next prime is 261138677. The reversal of 261138675 is 576831162.

It is not a de Polignac number, because 261138675 - 2² = 261138671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261138671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66877 + ... + 70673.

It is an arithmetic number, because the mean of its divisors is an integer number (10360944).

Almost surely, 2^261138675 is an apocalyptic number.

261138675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261138675 is a deficient number, since it is larger than the sum of its proper divisors (236186637).

261138675 is a wasteful number, since it uses less digits than its factorization.

261138675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948 (or 3943 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 261138675 is about 16159.7857349657. The cubic root of 261138675 is about 639.1808163338.

The spelling of 261138675 in words is "two hundred sixty-one million, one hundred thirty-eight thousand, six hundred seventy-five".