31818436 has 36 divisors (see below), whose sum is σ = 61489708. Its totient is φ = 14321088.

The previous prime is 31818433. The next prime is 31818439. The reversal of 31818436 is 63481813.

It is an interprime number because it is at equal distance from previous prime (31818433) and next prime (31818439).

It can be written as a sum of positive squares in 2 ways, for example, as 5089536 + 26728900 = 2256^2 + 5170^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31818433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114730 + ... + 115006.

Almost surely, 2^31818436 is an apocalyptic number.

It is an amenable number.

31818436 is a deficient number, since it is larger than the sum of its proper divisors (29671272).

31818436 is a wasteful number, since it uses less digits than its factorization.

31818436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 339 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 31818436 is about 5640.7832789427. The cubic root of 31818436 is about 316.8786235025.

The spelling of 31818436 in words is "thirty-one million, eight hundred eighteen thousand, four hundred thirty-six".