31043621 has 8 divisors (see below), whose sum is σ = 35518464. Its totient is φ = 26578800.

The previous prime is 31043609. The next prime is 31043657. The reversal of 31043621 is 12634013.

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

It is a cyclic number.

It is not a de Polignac number, because 31043621 - 2¹⁰ = 31042597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31043593 and 31043602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31043681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6131 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (4439808).

Almost surely, 2^31043621 is an apocalyptic number.

It is an amenable number.

31043621 is a deficient number, since it is larger than the sum of its proper divisors (4474843).

31043621 is a wasteful number, since it uses less digits than its factorization.

31043621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31043621 is about 5571.6802672084. The cubic root of 31043621 is about 314.2853404462.

Adding to 31043621 its reverse (12634013), we get a palindrome (43677634).

It can be divided in two parts, 310436 and 21, that multiplied together give a palindrome (6519156).

The spelling of 31043621 in words is "thirty-one million, forty-three thousand, six hundred twenty-one".