3123121530 has 64 divisors (see below), whose sum is σ = 7707312000. Its totient is φ = 809351424.

The previous prime is 3123121511. The next prime is 3123121531. The reversal of 3123121530 is 351213213.

It is a super-2 number, since 2×3123121530² = 19507776182299081800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3123121497 and 3123121506.

It is not an unprimeable number, because it can be changed into a prime (3123121531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1662952 + ... + 1664828.

It is an arithmetic number, because the mean of its divisors is an integer number (120426750).

Almost surely, 2^3123121530 is an apocalyptic number.

3123121530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3123121530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3853656000).

3123121530 is an abundant number, since it is smaller than the sum of its proper divisors (4584190470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3123121530 is a wasteful number, since it uses less digits than its factorization.

3123121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 3123121530 is about 55884.8953653847. The cubic root of 3123121530 is about 1461.7158674778.

Adding to 3123121530 its reverse (351213213), we get a palindrome (3474334743).

The spelling of 3123121530 in words is "three billion, one hundred twenty-three million, one hundred twenty-one thousand, five hundred thirty".