31363636 has 6 divisors (see below), whose sum is σ = 54886370. Its totient is φ = 15681816.

The previous prime is 31363621. The next prime is 31363649. The reversal of 31363636 is 63636313.

It can be written as a sum of positive squares in only one way, i.e., 21566736 + 9796900 = 4644^2 + 3130^2 .

31363636 is a modest number, since divided by 3636 gives 3136 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 31363598 and 31363607.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3920451 + ... + 3920458.

Almost surely, 2^31363636 is an apocalyptic number.

It is an amenable number.

31363636 is a deficient number, since it is larger than the sum of its proper divisors (23522734).

31363636 is a wasteful number, since it uses less digits than its factorization.

31363636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840913 (or 7840911 counting only the distinct ones).

The product of its digits is 17496, while the sum is 31.

The square root of 31363636 is about 5600.3246334476. The cubic root of 31363636 is about 315.3615936642.

Adding to 31363636 its reverse (63636313), we get a palindrome (94999949).

The spelling of 31363636 in words is "thirty-one million, three hundred sixty-three thousand, six hundred thirty-six".