31244381 has 8 divisors (see below), whose sum is σ = 35805120. Its totient is φ = 26707968.

The previous prime is 31244333. The next prime is 31244399. The reversal of 31244381 is 18344213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31244381 is a prime.

It is a super-2 number, since 2×31244381² = 1952422688146322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31244381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31246381) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3236 + ... + 8541.

It is an arithmetic number, because the mean of its divisors is an integer number (4475640).

Almost surely, 2^31244381 is an apocalyptic number.

It is an amenable number.

31244381 is a deficient number, since it is larger than the sum of its proper divisors (4560739).

31244381 is a wasteful number, since it uses less digits than its factorization.

31244381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12163.

The product of its digits is 2304, while the sum is 26.

The square root of 31244381 is about 5589.6673425169. The cubic root of 31244381 is about 314.9613826851.

Adding to 31244381 its reverse (18344213), we get a palindrome (49588594).

The spelling of 31244381 in words is "thirty-one million, two hundred forty-four thousand, three hundred eighty-one".