31804117 has 2 divisors, whose sum is σ = 31804118. Its totient is φ = 31804116.

The previous prime is 31804103. The next prime is 31804121. The reversal of 31804117 is 71140813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28451556 + 3352561 = 5334^2 + 1831^2 .

It is an emirp because it is prime and its reverse (71140813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31804117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31804091 and 31804100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31804177) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15902058 + 15902059.

It is an arithmetic number, because the mean of its divisors is an integer number (15902059).

Almost surely, 2^31804117 is an apocalyptic number.

It is an amenable number.

31804117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31804117 is an equidigital number, since it uses as much as digits as its factorization.

31804117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 31804117 is about 5639.5138974915. The cubic root of 31804117 is about 316.8310822403.

The spelling of 31804117 in words is "thirty-one million, eight hundred four thousand, one hundred seventeen".