31123211010113 has 4 divisors (see below), whose sum is σ = 31139881183920. Its totient is φ = 31106540836308.

The previous prime is 31123211010107. The next prime is 31123211010173. The reversal of 31123211010113 is 31101011232113.

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 a cyclic number.

It is not a de Polignac number, because 31123211010113 - 2¹⁰ = 31123211009089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123211010173) 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, 8335084103 + ... + 8335087836.

It is an arithmetic number, because the mean of its divisors is an integer number (7784970295980).

Almost surely, 2^{31123211010113} is an apocalyptic number.

It is an amenable number.

31123211010113 is a deficient number, since it is larger than the sum of its proper divisors (16670173807).

31123211010113 is a wasteful number, since it uses less digits than its factorization.

31123211010113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16670173806.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31123211010113 its reverse (31101011232113), we get a palindrome (62224222242226).

The spelling of 31123211010113 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred eleven million, ten thousand, one hundred thirteen".