31013321 has 8 divisors (see below), whose sum is σ = 33458184. Its totient is φ = 28637440.

The previous prime is 31013293. The next prime is 31013341. The reversal of 31013321 is 12331013.

It can be written as a sum of positive squares in 4 ways, for example, as 21160000 + 9853321 = 4600^2 + 3139^2 .

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 31013321 - 2¹⁰ = 31012297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31013296 and 31013305.

It is not an unprimeable number, because it can be changed into a prime (31013341) 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, 16310 + ... + 18111.

It is an arithmetic number, because the mean of its divisors is an integer number (4182273).

Almost surely, 2^31013321 is an apocalyptic number.

It is an amenable number.

31013321 is a deficient number, since it is larger than the sum of its proper divisors (2444863).

31013321 is a wasteful number, since it uses less digits than its factorization.

31013321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34491.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31013321 is about 5568.9604954605. The cubic root of 31013321 is about 314.1830548512.

Adding to 31013321 its reverse (12331013), we get a palindrome (43344334).

It can be divided in two parts, 310 and 13321, that added together give a palindrome (13631).

The spelling of 31013321 in words is "thirty-one million, thirteen thousand, three hundred twenty-one".