31116109 has 2 divisors, whose sum is σ = 31116110. Its totient is φ = 31116108.

The previous prime is 31116067. The next prime is 31116139. The reversal of 31116109 is 90161113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31114084 + 2025 = 5578^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 31116109 - 2¹⁵ = 31083341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31116109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31116139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15558054 + 15558055.

It is an arithmetic number, because the mean of its divisors is an integer number (15558055).

Almost surely, 2^31116109 is an apocalyptic number.

It is an amenable number.

31116109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31116109 is an equidigital number, since it uses as much as digits as its factorization.

31116109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 31116109 is about 5578.1815137193. The cubic root of 31116109 is about 314.5297729124.

The spelling of 31116109 in words is "thirty-one million, one hundred sixteen thousand, one hundred nine".