31111109 has 4 divisors (see below), whose sum is σ = 31291116. Its totient is φ = 30931104.

The previous prime is 31111103. The next prime is 31111121. The reversal of 31111109 is 90111113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24750625 + 6360484 = 4975^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111109 - 2⁸ = 31110853 is a prime.

It is a super-2 number, since 2×31111109² = 1935802206419762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89744 + ... + 90089.

It is an arithmetic number, because the mean of its divisors is an integer number (7822779).

Almost surely, 2^31111109 is an apocalyptic number.

It is an amenable number.

31111109 is a deficient number, since it is larger than the sum of its proper divisors (180007).

31111109 is a wasteful number, since it uses less digits than its factorization.

31111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180006.

The product of its (nonzero) digits is 27, while the sum is 17.

The square root of 31111109 is about 5577.7333209826. The cubic root of 31111109 is about 314.5129249071.

The spelling of 31111109 in words is "thirty-one million, one hundred eleven thousand, one hundred nine".