31113109 has 2 divisors, whose sum is σ = 31113110. Its totient is φ = 31113108.

The previous prime is 31113083. The next prime is 31113113. The reversal of 31113109 is 90131113.

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., 31024900 + 88209 = 5570^2 + 297^2 .

It is an emirp because it is prime and its reverse (90131113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31113109 - 2¹¹ = 31111061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113409) 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 as a sum of consecutive naturals, namely, 15556554 + 15556555.

It is an arithmetic number, because the mean of its divisors is an integer number (15556555).

Almost surely, 2^31113109 is an apocalyptic number.

It is an amenable number.

31113109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113109 is an equidigital number, since it uses as much as digits as its factorization.

31113109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 31113109 is about 5577.9126023989. The cubic root of 31113109 is about 314.5196643258.

The spelling of 31113109 in words is "thirty-one million, one hundred thirteen thousand, one hundred nine".