31323123213401 has 4 divisors (see below), whose sum is σ = 32087101828404. Its totient is φ = 30559144598400.

The previous prime is 31323123213379. The next prime is 31323123213419. The reversal of 31323123213401 is 10431232132313.

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 19010463289801 + 12312659923600 = 4360099^2 + 3508940^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323123213401 - 2³⁸ = 31048245306457 is a prime.

It is a super-2 number, since 2×31323123213401² (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 (31323123213001) 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, 381989307440 + ... + 381989307521.

It is an arithmetic number, because the mean of its divisors is an integer number (8021775457101).

Almost surely, 2^{31323123213401} is an apocalyptic number.

It is an amenable number.

31323123213401 is a deficient number, since it is larger than the sum of its proper divisors (763978615003).

31323123213401 is an equidigital number, since it uses as much as digits as its factorization.

31323123213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763978615002.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 31323123213401 its reverse (10431232132313), we get a palindrome (41754355345714).

The spelling of 31323123213401 in words is "thirty-one trillion, three hundred twenty-three billion, one hundred twenty-three million, two hundred thirteen thousand, four hundred one".