31144436 has 12 divisors (see below), whose sum is σ = 54627300. Its totient is φ = 15536640.

The previous prime is 31144423. The next prime is 31144441. The reversal of 31144436 is 63444113.

It can be written as a sum of positive squares in 2 ways, for example, as 24068836 + 7075600 = 4906^2 + 2660^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6875 + ... + 10466.

It is an arithmetic number, because the mean of its divisors is an integer number (4552275).

Almost surely, 2^31144436 is an apocalyptic number.

It is an amenable number.

31144436 is a deficient number, since it is larger than the sum of its proper divisors (23482864).

31144436 is a wasteful number, since it uses less digits than its factorization.

31144436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17794 (or 17792 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 31144436 is about 5580.7200252297. The cubic root of 31144436 is about 314.6251895400.

Adding to 31144436 its reverse (63444113), we get a palindrome (94588549).

The spelling of 31144436 in words is "thirty-one million, one hundred forty-four thousand, four hundred thirty-six".