31322129 has 2 divisors, whose sum is σ = 31322130. Its totient is φ = 31322128.

The previous prime is 31322119. The next prime is 31322149. The reversal of 31322129 is 92122313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30547729 + 774400 = 5527^2 + 880^2 .

It is an emirp because it is prime and its reverse (92122313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31322129 - 2¹² = 31318033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31322119) 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, 15661064 + 15661065.

It is an arithmetic number, because the mean of its divisors is an integer number (15661065).

Almost surely, 2^31322129 is an apocalyptic number.

It is an amenable number.

31322129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31322129 is an equidigital number, since it uses as much as digits as its factorization.

31322129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 31322129 is about 5596.6176392532. The cubic root of 31322129 is about 315.2224145176. Note that the first 3 decimals are identical.

The spelling of 31322129 in words is "thirty-one million, three hundred twenty-two thousand, one hundred twenty-nine".