31113217 has 2 divisors, whose sum is σ = 31113218. Its totient is φ = 31113216.

The previous prime is 31113211. The next prime is 31113221. The reversal of 31113217 is 71231113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26790976 + 4322241 = 5176^2 + 2079^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113217 - 2²³ = 22724609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31113194 and 31113203.

It is not a weakly prime, because it can be changed into another prime (31113211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556608 + 15556609.

It is an arithmetic number, because the mean of its divisors is an integer number (15556609).

It is a Proth number, since it is equal to 1899 ⋅ 2¹⁴ + 1 and 1899 < 2¹⁴.

Almost surely, 2^31113217 is an apocalyptic number.

It is an amenable number.

31113217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113217 is an equidigital number, since it uses as much as digits as its factorization.

31113217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126, while the sum is 19.

The square root of 31113217 is about 5577.9222834313. The cubic root of 31113217 is about 314.5200282462.

It can be divided in two parts, 3111 and 3217, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 31113217 in words is "thirty-one million, one hundred thirteen thousand, two hundred seventeen".