261717131 has 8 divisors (see below), whose sum is σ = 283408944. Its totient is φ = 240248160.

The previous prime is 261717121. The next prime is 261717133. The reversal of 261717131 is 131717162.

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-261717131 is a prime.

It is a super-2 number, since 2×261717131² = 136991713317742322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261717094 and 261717103.

It is not an unprimeable number, because it can be changed into a prime (261717133) 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 7 ways as a sum of consecutive naturals, for example, 53261 + ... + 57966.

It is an arithmetic number, because the mean of its divisors is an integer number (35426118).

Almost surely, 2^261717131 is an apocalyptic number.

261717131 is a deficient number, since it is larger than the sum of its proper divisors (21691813).

261717131 is a wasteful number, since it uses less digits than its factorization.

261717131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111421.

The product of its digits is 1764, while the sum is 29.

The square root of 261717131 is about 16177.6738439122. The cubic root of 261717131 is about 639.6524243889.

The spelling of 261717131 in words is "two hundred sixty-one million, seven hundred seventeen thousand, one hundred thirty-one".