31323020111 has 4 divisors (see below), whose sum is σ = 31337860224. Its totient is φ = 31308180000.

The previous prime is 31323020041. The next prime is 31323020137. The reversal of 31323020111 is 11102032313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11102032313 = 79609 ⋅139457.

It is a cyclic number.

It is not a de Polignac number, because 31323020111 - 2¹⁸ = 31322757967 is a prime.

It is a super-2 number, since 2×31323020111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31323020111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323020711) 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, 7416890 + ... + 7421111.

It is an arithmetic number, because the mean of its divisors is an integer number (7834465056).

Almost surely, 2^31323020111 is an apocalyptic number.

31323020111 is a deficient number, since it is larger than the sum of its proper divisors (14840113).

31323020111 is a wasteful number, since it uses less digits than its factorization.

31323020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14840112.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31323020111 its reverse (11102032313), we get a palindrome (42425052424).

The spelling of 31323020111 in words is "thirty-one billion, three hundred twenty-three million, twenty thousand, one hundred eleven".