31011011121 has 4 divisors (see below), whose sum is σ = 41348014832. Its totient is φ = 20674007412.

The previous prime is 31011011081. The next prime is 31011011123. The reversal of 31011011121 is 12111011013.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12111011013 = 3 ⋅4037003671.

It is not a de Polignac number, because 31011011121 - 2¹⁰ = 31011010097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31011011097 and 31011011106.

It is not an unprimeable number, because it can be changed into a prime (31011011123) 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, 5168501851 + ... + 5168501856.

It is an arithmetic number, because the mean of its divisors is an integer number (10337003708).

Almost surely, 2^31011011121 is an apocalyptic number.

It is an amenable number.

31011011121 is a deficient number, since it is larger than the sum of its proper divisors (10337003711).

31011011121 is a wasteful number, since it uses less digits than its factorization.

31011011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10337003710.

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

Adding to 31011011121 its reverse (12111011013), we get a palindrome (43122022134).

The spelling of 31011011121 in words is "thirty-one billion, eleven million, eleven thousand, one hundred twenty-one".