31220109 has 24 divisors (see below), whose sum is σ = 47960640. Its totient is φ = 19502208.

The previous prime is 31220093. The next prime is 31220159. The reversal of 31220109 is 90102213.

It is a happy number.

It is not a de Polignac number, because 31220109 - 2⁴ = 31220093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31220091 and 31220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63864 + ... + 64350.

It is an arithmetic number, because the mean of its divisors is an integer number (1998360).

Almost surely, 2^31220109 is an apocalyptic number.

It is an amenable number.

31220109 is a deficient number, since it is larger than the sum of its proper divisors (16740531).

31220109 is a wasteful number, since it uses less digits than its factorization.

31220109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 31220109 is about 5587.4957718105. The cubic root of 31220109 is about 314.8798029697.

It can be divided in two parts, 31220 and 109, that added together give a square (31329 = 177²).

The spelling of 31220109 in words is "thirty-one million, two hundred twenty thousand, one hundred nine".