261610031 has 8 divisors (see below), whose sum is σ = 276324720. Its totient is φ = 246989952.

The previous prime is 261610003. The next prime is 261610033. The reversal of 261610031 is 130016162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261610031 is a prime.

It is a super-2 number, since 2×261610031² = 136879616639641922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261609985 and 261610012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261610033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17930 + ... + 29063.

It is an arithmetic number, because the mean of its divisors is an integer number (34540590).

Almost surely, 2^261610031 is an apocalyptic number.

261610031 is a deficient number, since it is larger than the sum of its proper divisors (14714689).

261610031 is a wasteful number, since it uses less digits than its factorization.

261610031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47305.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 261610031 is about 16174.3633877813. The cubic root of 261610031 is about 639.5651595350.

Adding to 261610031 its reverse (130016162), we get a palindrome (391626193).

The spelling of 261610031 in words is "two hundred sixty-one million, six hundred ten thousand, thirty-one".