31232220001 has 4 divisors (see below), whose sum is σ = 31541450004. Its totient is φ = 30922990000.

The previous prime is 31232219989. The next prime is 31232220013. The reversal of 31232220001 is 10002223213.

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

It is an interprime number because it is at equal distance from previous prime (31232219989) and next prime (31232220013).

It can be written as a sum of positive squares in 2 ways, for example, as 22260341601 + 8971878400 = 149199^2 + 94720^2 .

It is a cyclic number.

It is not a de Polignac number, because 31232220001 - 2⁷ = 31232219873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31232220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154614850 + ... + 154615051.

It is an arithmetic number, because the mean of its divisors is an integer number (7885362501).

Almost surely, 2^31232220001 is an apocalyptic number.

It is an amenable number.

31232220001 is a deficient number, since it is larger than the sum of its proper divisors (309230003).

31232220001 is a wasteful number, since it uses less digits than its factorization.

31232220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309230002.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31232220001 its reverse (10002223213), we get a palindrome (41234443214).

The spelling of 31232220001 in words is "thirty-one billion, two hundred thirty-two million, two hundred twenty thousand, one".