31120109 has 2 divisors, whose sum is σ = 31120110. Its totient is φ = 31120108.

The previous prime is 31120091. The next prime is 31120121. The reversal of 31120109 is 90102113.

It is a happy number.

Together with previous prime (31120091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18088009 + 13032100 = 4253^2 + 3610^2 .

It is an emirp because it is prime and its reverse (90102113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31120109 - 2¹² = 31116013 is a prime.

It is a super-2 number, since 2×31120109² = 1936922368343762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31120009) 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, 15560054 + 15560055.

It is an arithmetic number, because the mean of its divisors is an integer number (15560055).

Almost surely, 2^31120109 is an apocalyptic number.

It is an amenable number.

31120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31120109 is an equidigital number, since it uses as much as digits as its factorization.

31120109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 31120109 is about 5578.5400419823. The cubic root of 31120109 is about 314.5432500172.

The spelling of 31120109 in words is "thirty-one million, one hundred twenty thousand, one hundred nine".