31321316 has 12 divisors (see below), whose sum is σ = 59028732. Its totient is φ = 14455968.

The previous prime is 31321313. The next prime is 31321319. The reversal of 31321316 is 61312313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31321313) and next prime (31321319).

It can be written as a sum of positive squares in 2 ways, for example, as 16080100 + 15241216 = 4010^2 + 3904^2 .

It is not an unprimeable number, because it can be changed into a prime (31321313) 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, 301115 + ... + 301218.

It is an arithmetic number, because the mean of its divisors is an integer number (4919061).

Almost surely, 2^31321316 is an apocalyptic number.

It is an amenable number.

31321316 is a deficient number, since it is larger than the sum of its proper divisors (27707416).

31321316 is a wasteful number, since it uses less digits than its factorization.

31321316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602350 (or 602348 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 31321316 is about 5596.5450056262. The cubic root of 31321316 is about 315.2196871802.

Adding to 31321316 its reverse (61312313), we get a palindrome (92633629).

The spelling of 31321316 in words is "thirty-one million, three hundred twenty-one thousand, three hundred sixteen".