8131213524 has 96 divisors (see below), whose sum is σ = 22014268416. Its totient is φ = 2287918080.

The previous prime is 8131213463. The next prime is 8131213537. The reversal of 8131213524 is 4253121318.

It is a super-2 number, since 2×8131213524² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8131213491 and 8131213500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2417604 + ... + 2420964.

It is an arithmetic number, because the mean of its divisors is an integer number (229315296).

Almost surely, 2^8131213524 is an apocalyptic number.

8131213524 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8131213524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11007134208).

8131213524 is an abundant number, since it is smaller than the sum of its proper divisors (13883054892).

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

8131213524 is a wasteful number, since it uses less digits than its factorization.

8131213524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805 (or 3803 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 8131213524 is about 90173.2417294621. The cubic root of 8131213524 is about 2010.8752179658.

The spelling of 8131213524 in words is "eight billion, one hundred thirty-one million, two hundred thirteen thousand, five hundred twenty-four".