31063621 has 4 divisors (see below), whose sum is σ = 31199500. Its totient is φ = 30927744.

The previous prime is 31063619. The next prime is 31063633. The reversal of 31063621 is 12636013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12636013 = 13 ⋅972001.

It can be written as a sum of positive squares in 2 ways, for example, as 30140100 + 923521 = 5490^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 31063621 - 2¹ = 31063619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31063592 and 31063601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31063601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67596 + ... + 68053.

It is an arithmetic number, because the mean of its divisors is an integer number (7799875).

Almost surely, 2^31063621 is an apocalyptic number.

It is an amenable number.

31063621 is a deficient number, since it is larger than the sum of its proper divisors (135879).

31063621 is a wasteful number, since it uses less digits than its factorization.

31063621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135878.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 31063621 is about 5573.4747689390. The cubic root of 31063621 is about 314.3528192306.

Adding to 31063621 its reverse (12636013), we get a palindrome (43699634).

It can be divided in two parts, 31063 and 621, that added together give a square (31684 = 178²).

The spelling of 31063621 in words is "thirty-one million, sixty-three thousand, six hundred twenty-one".