513131321212 has 48 divisors (see below), whose sum is σ = 951325466112. Its totient is φ = 241667046720.

The previous prime is 513131321203. The next prime is 513131321233. The reversal of 513131321212 is 212123131315.

It is a super-2 number, since 2×513131321212² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21025537 + ... + 21049927.

It is an arithmetic number, because the mean of its divisors is an integer number (19819280544).

Almost surely, 2^513131321212 is an apocalyptic number.

It is an amenable number.

513131321212 is a deficient number, since it is larger than the sum of its proper divisors (438194144900).

513131321212 is a wasteful number, since it uses less digits than its factorization.

513131321212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27898 (or 27896 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

Adding to 513131321212 its reverse (212123131315), we get a palindrome (725254452527).

The spelling of 513131321212 in words is "five hundred thirteen billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred twelve".