31342121 has 2 divisors, whose sum is σ = 31342122. Its totient is φ = 31342120.

The previous prime is 31342097. The next prime is 31342139. The reversal of 31342121 is 12124313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 11316496 = 4475^2 + 3364^2 .

It is an emirp because it is prime and its reverse (12124313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31342121 - 2⁶ = 31342057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31342121.

It is not a weakly prime, because it can be changed into another prime (31342021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671060 + 15671061.

It is an arithmetic number, because the mean of its divisors is an integer number (15671061).

Almost surely, 2^31342121 is an apocalyptic number.

It is an amenable number.

31342121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31342121 is an equidigital number, since it uses as much as digits as its factorization.

31342121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 31342121 is about 5598.4034331227. The cubic root of 31342121 is about 315.2894660071.

Adding to 31342121 its reverse (12124313), we get a palindrome (43466434).

The spelling of 31342121 in words is "thirty-one million, three hundred forty-two thousand, one hundred twenty-one".