31117261 has 8 divisors (see below), whose sum is σ = 36789120. Its totient is φ = 25752048.

The previous prime is 31117253. The next prime is 31117267. The reversal of 31117261 is 16271113.

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

It is not a de Polignac number, because 31117261 - 2³ = 31117253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31117267) 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, 76441 + ... + 76846.

It is an arithmetic number, because the mean of its divisors is an integer number (4598640).

Almost surely, 2^31117261 is an apocalyptic number.

It is an amenable number.

31117261 is a deficient number, since it is larger than the sum of its proper divisors (5671859).

31117261 is a wasteful number, since it uses less digits than its factorization.

31117261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153323.

The product of its digits is 252, while the sum is 22.

The square root of 31117261 is about 5578.2847722217. The cubic root of 31117261 is about 314.5336544370.

Adding to 31117261 its reverse (16271113), we get a palindrome (47388374).

The spelling of 31117261 in words is "thirty-one million, one hundred seventeen thousand, two hundred sixty-one".