31211201123 has 8 divisors (see below), whose sum is σ = 31907481600. Its totient is φ = 30516262920.

The previous prime is 31211201113. The next prime is 31211201137. The reversal of 31211201123 is 32110211213.

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 31211201123 - 2⁴ = 31211201107 is a prime.

It is a super-2 number, since 2×31211201123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211201113) 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, 288473 + ... + 381626.

It is an arithmetic number, because the mean of its divisors is an integer number (3988435200).

Almost surely, 2^31211201123 is an apocalyptic number.

31211201123 is a deficient number, since it is larger than the sum of its proper divisors (696280477).

31211201123 is an equidigital number, since it uses as much as digits as its factorization.

31211201123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671137.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211201123 its reverse (32110211213), we get a palindrome (63321412336).

The spelling of 31211201123 in words is "thirty-one billion, two hundred eleven million, two hundred one thousand, one hundred twenty-three".