31323220001 has 4 divisors (see below), whose sum is σ = 33165762372. Its totient is φ = 29480677632.

The previous prime is 31323219989. The next prime is 31323220031. The reversal of 31323220001 is 10002232313.

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 27638730001 + 3684490000 = 166249^2 + 60700^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323220001 - 2¹⁴ = 31323203617 is a prime.

It is a super-2 number, since 2×31323220001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1842542353 = 31323220001 / (3 + 1 + 3 + 2 + 3 + 2 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31323220031) 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, 921271160 + ... + 921271193.

It is an arithmetic number, because the mean of its divisors is an integer number (8291440593).

Almost surely, 2^31323220001 is an apocalyptic number.

It is an amenable number.

31323220001 is a deficient number, since it is larger than the sum of its proper divisors (1842542371).

31323220001 is a wasteful number, since it uses less digits than its factorization.

31323220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842542370.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31323220001 its reverse (10002232313), we get a palindrome (41325452314).

The spelling of 31323220001 in words is "thirty-one billion, three hundred twenty-three million, two hundred twenty thousand, one".