31273117 has 2 divisors, whose sum is σ = 31273118. Its totient is φ = 31273116.

The previous prime is 31273093. The next prime is 31273139. The reversal of 31273117 is 71137213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 11148921 = 4486^2 + 3339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31273117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31273091 and 31273100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31273147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15636558 + 15636559.

It is an arithmetic number, because the mean of its divisors is an integer number (15636559).

Almost surely, 2^31273117 is an apocalyptic number.

It is an amenable number.

31273117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31273117 is an equidigital number, since it uses as much as digits as its factorization.

31273117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882, while the sum is 25.

The square root of 31273117 is about 5592.2372088458. The cubic root of 31273117 is about 315.0579115831.

The spelling of 31273117 in words is "thirty-one million, two hundred seventy-three thousand, one hundred seventeen".