31831201 has 2 divisors, whose sum is σ = 31831202. Its totient is φ = 31831200.

The previous prime is 31831199. The next prime is 31831271. The reversal of 31831201 is 10213813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 9928801 = 4680^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 31831201 - 2¹ = 31831199 is a prime.

Together with 31831199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31831271) 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, 15915600 + 15915601.

It is an arithmetic number, because the mean of its divisors is an integer number (15915601).

Almost surely, 2^31831201 is an apocalyptic number.

It is an amenable number.

31831201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31831201 is an equidigital number, since it uses as much as digits as its factorization.

31831201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 31831201 is about 5641.9146572773. The cubic root of 31831201 is about 316.9209932241.

The spelling of 31831201 in words is "thirty-one million, eight hundred thirty-one thousand, two hundred one".