31112111001 has 4 divisors (see below), whose sum is σ = 41482814672. Its totient is φ = 20741407332.

The previous prime is 31112110987. The next prime is 31112111011. The reversal of 31112111001 is 10011121113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31112111001 - 2⁵ = 31112110969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31112111011) 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, 5185351831 + ... + 5185351836.

It is an arithmetic number, because the mean of its divisors is an integer number (10370703668).

Almost surely, 2^31112111001 is an apocalyptic number.

It is an amenable number.

31112111001 is a deficient number, since it is larger than the sum of its proper divisors (10370703671).

31112111001 is a wasteful number, since it uses less digits than its factorization.

31112111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370703670.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 31112111001 its reverse (10011121113), we get a palindrome (41123232114).

It can be divided in two parts, 3111 and 2111001, that added together give a palindrome (2114112).

The spelling of 31112111001 in words is "thirty-one billion, one hundred twelve million, one hundred eleven thousand, one".