31123320311 has 8 divisors (see below), whose sum is σ = 31448411904. Its totient is φ = 30799918080.

The previous prime is 31123320247. The next prime is 31123320317. The reversal of 31123320311 is 11302332113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31123320311 - 2⁶ = 31123320247 is a prime.

It is a super-2 number, since 2×31123320311² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123320317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385286 + ... + 459011.

It is an arithmetic number, because the mean of its divisors is an integer number (3931051488).

Almost surely, 2^31123320311 is an apocalyptic number.

31123320311 is a deficient number, since it is larger than the sum of its proper divisors (325091593).

31123320311 is a wasteful number, since it uses less digits than its factorization.

31123320311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844681.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31123320311 its reverse (11302332113), we get a palindrome (42425652424).

The spelling of 31123320311 in words is "thirty-one billion, one hundred twenty-three million, three hundred twenty thousand, three hundred eleven".