31331213033123 has 4 divisors (see below), whose sum is σ = 31333400523048. Its totient is φ = 31329025543200.

The previous prime is 31331213033101. The next prime is 31331213033147. The reversal of 31331213033123 is 32133031213313.

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 31331213033123 - 2³⁰ = 31330139291299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31331213063123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093723478 + ... + 1093752123.

It is an arithmetic number, because the mean of its divisors is an integer number (7833350130762).

Almost surely, 2^{31331213033123} is an apocalyptic number.

31331213033123 is a deficient number, since it is larger than the sum of its proper divisors (2187489925).

31331213033123 is a wasteful number, since it uses less digits than its factorization.

31331213033123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187489924.

The product of its (nonzero) digits is 8748, while the sum is 29.

Adding to 31331213033123 its reverse (32133031213313), we get a palindrome (63464244246436).

The spelling of 31331213033123 in words is "thirty-one trillion, three hundred thirty-one billion, two hundred thirteen million, thirty-three thousand, one hundred twenty-three".