31161117 has 8 divisors (see below), whose sum is σ = 44744224. Its totient is φ = 19176048.

The previous prime is 31161103. The next prime is 31161131. The reversal of 31161117 is 71116113.

It is an interprime number because it is at equal distance from previous prime (31161103) and next prime (31161131).

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

It is not a de Polignac number, because 31161117 - 2¹⁹ = 30636829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31161093 and 31161102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31161217) 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, 399463 + ... + 399540.

It is an arithmetic number, because the mean of its divisors is an integer number (5593028).

Almost surely, 2^31161117 is an apocalyptic number.

It is an amenable number.

31161117 is a deficient number, since it is larger than the sum of its proper divisors (13583107).

31161117 is a wasteful number, since it uses less digits than its factorization.

31161117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799019.

The product of its digits is 126, while the sum is 21.

The square root of 31161117 is about 5582.2143455801. The cubic root of 31161117 is about 314.6813507334.

The spelling of 31161117 in words is "thirty-one million, one hundred sixty-one thousand, one hundred seventeen".