31201112011 has 4 divisors (see below), whose sum is σ = 31201792272. Its totient is φ = 31200431752.

The previous prime is 31201112003. The next prime is 31201112017. The reversal of 31201112011 is 11021110213.

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 31201112011 - 2³ = 31201112003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31201111982 and 31201112000.

It is not an unprimeable number, because it can be changed into a prime (31201112017) 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, 265936 + ... + 364861.

It is an arithmetic number, because the mean of its divisors is an integer number (7800448068).

Almost surely, 2^31201112011 is an apocalyptic number.

31201112011 is a deficient number, since it is larger than the sum of its proper divisors (680261).

31201112011 is an equidigital number, since it uses as much as digits as its factorization.

31201112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680260.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31201112011 its reverse (11021110213), we get a palindrome (42222222224).

The spelling of 31201112011 in words is "thirty-one billion, two hundred one million, one hundred twelve thousand, eleven".