31201444121 has 4 divisors (see below), whose sum is σ = 32558028672. Its totient is φ = 29844859572.

The previous prime is 31201444117. The next prime is 31201444133. The reversal of 31201444121 is 12144410213.

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 31201444121 - 2² = 31201444117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1356584527 = 31201444121 / (3 + 1 + 2 + 0 + 1 + 4 + 4 + 4 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (31201444151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678292241 + ... + 678292286.

It is an arithmetic number, because the mean of its divisors is an integer number (8139507168).

Almost surely, 2^31201444121 is an apocalyptic number.

It is an amenable number.

31201444121 is a deficient number, since it is larger than the sum of its proper divisors (1356584551).

31201444121 is a wasteful number, since it uses less digits than its factorization.

31201444121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356584550.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31201444121 its reverse (12144410213), we get a palindrome (43345854334).

The spelling of 31201444121 in words is "thirty-one billion, two hundred one million, four hundred forty-four thousand, one hundred twenty-one".