31122001 has 4 divisors (see below), whose sum is σ = 31205812. Its totient is φ = 31038192.

The previous prime is 31121999. The next prime is 31122023. The reversal of 31122001 is 10022113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7160976 + 23961025 = 2676^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122001 - 2¹ = 31121999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31122031) 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 in 3 ways as a sum of consecutive naturals, for example, 41346 + ... + 42091.

It is an arithmetic number, because the mean of its divisors is an integer number (7801453).

Almost surely, 2^31122001 is an apocalyptic number.

It is an amenable number.

31122001 is a deficient number, since it is larger than the sum of its proper divisors (83811).

31122001 is an equidigital number, since it uses as much as digits as its factorization.

31122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83810.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 31122001 is about 5578.7096178238. The cubic root of 31122001 is about 314.5496242855.

Adding to 31122001 its reverse (10022113), we get a palindrome (41144114).

The spelling of 31122001 in words is "thirty-one million, one hundred twenty-two thousand, one".