31224020131 has 4 divisors (see below), whose sum is σ = 31225486432. Its totient is φ = 31222553832.

The previous prime is 31224020083. The next prime is 31224020153. The reversal of 31224020131 is 13102042213.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31224020131 - 2¹³ = 31224011939 is a prime.

It is a super-2 number, since 2×31224020131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31224020099 and 31224020108.

It is not an unprimeable number, because it can be changed into a prime (31224020161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700731 + ... + 743956.

It is an arithmetic number, because the mean of its divisors is an integer number (7806371608).

Almost surely, 2^31224020131 is an apocalyptic number.

31224020131 is a deficient number, since it is larger than the sum of its proper divisors (1466301).

31224020131 is a wasteful number, since it uses less digits than its factorization.

31224020131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466300.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31224020131 its reverse (13102042213), we get a palindrome (44326062344).

The spelling of 31224020131 in words is "thirty-one billion, two hundred twenty-four million, twenty thousand, one hundred thirty-one".