31530456123 has 8 divisors (see below), whose sum is σ = 42114236736. Its totient is φ = 20983489800.

The previous prime is 31530456119. The next prime is 31530456137. The reversal of 31530456123 is 32165403513.

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

It is not a de Polignac number, because 31530456123 - 2² = 31530456119 is a prime.

It is a super-2 number, since 2×31530456123² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31530456163) 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, 9201573 + ... + 9204998.

It is an arithmetic number, because the mean of its divisors is an integer number (5264279592).

Almost surely, 2^31530456123 is an apocalyptic number.

31530456123 is a deficient number, since it is larger than the sum of its proper divisors (10583780613).

31530456123 is a wasteful number, since it uses less digits than its factorization.

31530456123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18407145.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 31530456123 its reverse (32165403513), we get a palindrome (63695859636).

The spelling of 31530456123 in words is "thirty-one billion, five hundred thirty million, four hundred fifty-six thousand, one hundred twenty-three".