3111142520 has 16 divisors (see below), whose sum is σ = 7000070760. Its totient is φ = 1244456992.

The previous prime is 3111142483. The next prime is 3111142537. The reversal of 3111142520 is 252411113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3111142492 and 3111142501.

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, 38889242 + ... + 38889321.

Almost surely, 2^3111142520 is an apocalyptic number.

It is an amenable number.

3111142520 is an abundant number, since it is smaller than the sum of its proper divisors (3888928240).

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

3111142520 is a wasteful number, since it uses less digits than its factorization.

3111142520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778574 (or 77778570 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 3111142520 is about 55777.6166575805. The cubic root of 3111142520 is about 1459.8446259876.

Adding to 3111142520 its reverse (252411113), we get a palindrome (3363553633).

The spelling of 3111142520 in words is "three billion, one hundred eleven million, one hundred forty-two thousand, five hundred twenty".