31230023133 has 4 divisors (see below), whose sum is σ = 41640030848. Its totient is φ = 20820015420.

The previous prime is 31230023129. The next prime is 31230023141. The reversal of 31230023133 is 33132003213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31230023133 - 2² = 31230023129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230023333) 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, 5205003853 + ... + 5205003858.

It is an arithmetic number, because the mean of its divisors is an integer number (10410007712).

Almost surely, 2^31230023133 is an apocalyptic number.

It is an amenable number.

31230023133 is a deficient number, since it is larger than the sum of its proper divisors (10410007715).

31230023133 is a wasteful number, since it uses less digits than its factorization.

31230023133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410007714.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31230023133 its reverse (33132003213), we get a palindrome (64362026346).

The spelling of 31230023133 in words is "thirty-one billion, two hundred thirty million, twenty-three thousand, one hundred thirty-three".