31003011121 has 4 divisors (see below), whose sum is σ = 32072080500. Its totient is φ = 29933941744.

The previous prime is 31003011107. The next prime is 31003011133. The reversal of 31003011121 is 12111030013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8416227600 + 22586783521 = 91740^2 + 150289^2 .

It is a cyclic number.

It is not a de Polignac number, because 31003011121 - 2²⁷ = 30868793393 is a prime.

It is a super-2 number, since 2×31003011121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31003411121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534534646 + ... + 534534703.

It is an arithmetic number, because the mean of its divisors is an integer number (8018020125).

Almost surely, 2^31003011121 is an apocalyptic number.

It is an amenable number.

31003011121 is a deficient number, since it is larger than the sum of its proper divisors (1069069379).

31003011121 is a wasteful number, since it uses less digits than its factorization.

31003011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069069378.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31003011121 its reverse (12111030013), we get a palindrome (43114041134).

The spelling of 31003011121 in words is "thirty-one billion, three million, eleven thousand, one hundred twenty-one".