31678109 has 4 divisors (see below), whose sum is σ = 31731420. Its totient is φ = 31624800.

The previous prime is 31678091. The next prime is 31678133. The reversal of 31678109 is 90187613.

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 12581209 + 19096900 = 3547^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 31678109 - 2¹⁶ = 31612573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31678169) 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, 25754 + ... + 26955.

It is an arithmetic number, because the mean of its divisors is an integer number (7932855).

Almost surely, 2^31678109 is an apocalyptic number.

It is an amenable number.

31678109 is a deficient number, since it is larger than the sum of its proper divisors (53311).

31678109 is an equidigital number, since it uses as much as digits as its factorization.

31678109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53310.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 31678109 is about 5628.3309248835. The cubic root of 31678109 is about 316.4120998727.

The spelling of 31678109 in words is "thirty-one million, six hundred seventy-eight thousand, one hundred nine".