31602121 has 2 divisors, whose sum is σ = 31602122. Its totient is φ = 31602120.

The previous prime is 31602097. The next prime is 31602143. The reversal of 31602121 is 12120613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 921600 = 5539^2 + 960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31602121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31602095 and 31602104.

It is not a weakly prime, because it can be changed into another prime (31602421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15801060 + 15801061.

It is an arithmetic number, because the mean of its divisors is an integer number (15801061).

Almost surely, 2^31602121 is an apocalyptic number.

It is an amenable number.

31602121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31602121 is an equidigital number, since it uses as much as digits as its factorization.

31602121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31602121 is about 5621.5763803403. The cubic root of 31602121 is about 316.1588990147.

Adding to 31602121 its reverse (12120613), we get a palindrome (43722734).

The spelling of 31602121 in words is "thirty-one million, six hundred two thousand, one hundred twenty-one".