31020220031 has 4 divisors (see below), whose sum is σ = 31034458200. Its totient is φ = 31005981864.

The previous prime is 31020220013. The next prime is 31020220057. The reversal of 31020220031 is 13002202013.

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 31020220031 - 2¹⁰ = 31020219007 is a prime.

It is a super-2 number, since 2×31020220031² (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 = 31020219988 and 31020220015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020270031) 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, 7115816 + ... + 7120173.

It is an arithmetic number, because the mean of its divisors is an integer number (7758614550).

Almost surely, 2^31020220031 is an apocalyptic number.

31020220031 is a deficient number, since it is larger than the sum of its proper divisors (14238169).

31020220031 is a wasteful number, since it uses less digits than its factorization.

31020220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14238168.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31020220031 its reverse (13002202013), we get a palindrome (44022422044).

The spelling of 31020220031 in words is "thirty-one billion, twenty million, two hundred twenty thousand, thirty-one".