3123131420 has 12 divisors (see below), whose sum is σ = 6558576024. Its totient is φ = 1249252560.

The previous prime is 3123131419. The next prime is 3123131437. The reversal of 3123131420 is 241313213.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 156156571 = 3123131420 / (3 + 1 + 2 + 3 + 1 + 3 + 1 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 3123131392 and 3123131401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78078266 + ... + 78078305.

It is an arithmetic number, because the mean of its divisors is an integer number (546548002).

Almost surely, 2^3123131420 is an apocalyptic number.

It is an amenable number.

3123131420 is an abundant number, since it is smaller than the sum of its proper divisors (3435444604).

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

3123131420 is a wasteful number, since it uses less digits than its factorization.

3123131420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156156580 (or 156156578 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3123131420 is about 55884.9838507626. The cubic root of 3123131420 is about 1461.7174104164.

Adding to 3123131420 its reverse (241313213), we get a palindrome (3364444633).

The spelling of 3123131420 in words is "three billion, one hundred twenty-three million, one hundred thirty-one thousand, four hundred twenty".