31332001 has 2 divisors, whose sum is σ = 31332002. Its totient is φ = 31332000.

The previous prime is 31331999. The next prime is 31332011. The reversal of 31332001 is 10023313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30813601 + 518400 = 5551^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 31332001 - 2¹ = 31331999 is a prime.

Together with 31331999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31332011) 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, 15666000 + 15666001.

It is an arithmetic number, because the mean of its divisors is an integer number (15666001).

Almost surely, 2^31332001 is an apocalyptic number.

It is an amenable number.

31332001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31332001 is an equidigital number, since it uses as much as digits as its factorization.

31332001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31332001 is about 5597.4995310406. The cubic root of 31332001 is about 315.2555279415.

Adding to 31332001 its reverse (10023313), we get a palindrome (41355314).

The spelling of 31332001 in words is "thirty-one million, three hundred thirty-two thousand, one".