321611331431 has 4 divisors (see below), whose sum is σ = 346350664632. Its totient is φ = 296871998232.

The previous prime is 321611331409. The next prime is 321611331451. The reversal of 321611331431 is 134133116123.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 321611331431 - 2³⁸ = 46733424487 is a prime.

It is a super-2 number, since 2×321611331431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321611331394 and 321611331403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321611331451) 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, 12369666581 + ... + 12369666606.

It is an arithmetic number, because the mean of its divisors is an integer number (86587666158).

Almost surely, 2^321611331431 is an apocalyptic number.

321611331431 is a deficient number, since it is larger than the sum of its proper divisors (24739333201).

321611331431 is a wasteful number, since it uses less digits than its factorization.

321611331431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24739333200.

The product of its digits is 3888, while the sum is 29.

Adding to 321611331431 its reverse (134133116123), we get a palindrome (455744447554).

The spelling of 321611331431 in words is "three hundred twenty-one billion, six hundred eleven million, three hundred thirty-one thousand, four hundred thirty-one".