31123320103201 has 4 divisors (see below), whose sum is σ = 31123583147412. Its totient is φ = 31123057058992.

The previous prime is 31123320103097. The next prime is 31123320103207. The reversal of 31123320103201 is 10230102332113.

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 17708534838801 + 13414785264400 = 4208151^2 + 3662620^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123320103201 - 2³³ = 31114730168609 is a prime.

It is a super-2 number, since 2×31123320103201² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123320103207) 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, 131344546 + ... + 131581291.

It is an arithmetic number, because the mean of its divisors is an integer number (7780895786853).

Almost surely, 2^{31123320103201} is an apocalyptic number.

It is an amenable number.

31123320103201 is a deficient number, since it is larger than the sum of its proper divisors (263044211).

31123320103201 is a wasteful number, since it uses less digits than its factorization.

31123320103201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263044210.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31123320103201 its reverse (10230102332113), we get a palindrome (41353422435314).

The spelling of 31123320103201 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred twenty million, one hundred three thousand, two hundred one".