31122231001 has 4 divisors (see below), whose sum is σ = 31430372004. Its totient is φ = 30814090000.

The previous prime is 31122230941. The next prime is 31122231029. The reversal of 31122231001 is 10013222113.

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 22066805401 + 9055425600 = 148549^2 + 95160^2 .

It is not a de Polignac number, because 31122231001 - 2³¹ = 28974747353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31122231061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154070350 + ... + 154070551.

It is an arithmetic number, because the mean of its divisors is an integer number (7857593001).

Almost surely, 2^31122231001 is an apocalyptic number.

It is an amenable number.

31122231001 is a deficient number, since it is larger than the sum of its proper divisors (308141003).

31122231001 is a wasteful number, since it uses less digits than its factorization.

31122231001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308141002.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31122231001 its reverse (10013222113), we get a palindrome (41135453114).

The spelling of 31122231001 in words is "thirty-one billion, one hundred twenty-two million, two hundred thirty-one thousand, one".