31413321 has 12 divisors (see below), whose sum is σ = 45456372. Its totient is φ = 20904576.

The previous prime is 31413313. The next prime is 31413329. The reversal of 31413321 is 12331413.

It is an interprime number because it is at equal distance from previous prime (31413313) and next prime (31413329).

It can be written as a sum of positive squares in 2 ways, for example, as 1863225 + 29550096 = 1365^2 + 5436^2 .

It is not a de Polignac number, because 31413321 - 2³ = 31413313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31413294 and 31413303.

It is not an unprimeable number, because it can be changed into a prime (31413329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2725 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (3788031).

Almost surely, 2^31413321 is an apocalyptic number.

It is an amenable number.

31413321 is a deficient number, since it is larger than the sum of its proper divisors (14043051).

31413321 is a wasteful number, since it uses less digits than its factorization.

31413321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6280 (or 6277 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31413321 is about 5604.7587816069. The cubic root of 31413321 is about 315.5280334878.

Adding to 31413321 its reverse (12331413), we get a palindrome (43744734).

The spelling of 31413321 in words is "thirty-one million, four hundred thirteen thousand, three hundred twenty-one".