261183130 has 32 divisors (see below), whose sum is σ = 508095504. Its totient is φ = 96093696.

The previous prime is 261183127. The next prime is 261183137. The reversal of 261183130 is 31381162.

It can be written as a sum of positive squares in 8 ways, for example, as 48344209 + 212838921 = 6953^2 + 14589^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261183095 and 261183104.

It is not an unprimeable number, because it can be changed into a prime (261183137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34662 + ... + 41518.

Almost surely, 2^261183130 is an apocalyptic number.

261183130 is a deficient number, since it is larger than the sum of its proper divisors (246912374).

261183130 is a wasteful number, since it uses less digits than its factorization.

261183130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7170.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 261183130 is about 16161.1611587782. The cubic root of 261183130 is about 639.2170846383.

The spelling of 261183130 in words is "two hundred sixty-one million, one hundred eighty-three thousand, one hundred thirty".