531512065920 has 512 divisors, whose sum is σ = 1893976473600. Its totient is φ = 125680066560.

The previous prime is 531512065901. The next prime is 531512065939. The reversal of 531512065920 is 29560215135.

It is an interprime number because it is at equal distance from previous prime (531512065901) and next prime (531512065939).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 364298151 + ... + 364299609.

It is an arithmetic number, because the mean of its divisors is an integer number (3699172800).

Almost surely, 2^531512065920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531512065920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946988236800).

531512065920 is an abundant number, since it is smaller than the sum of its proper divisors (1362464407680).

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

531512065920 is a wasteful number, since it uses less digits than its factorization.

531512065920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 531512065920 in words is "five hundred thirty-one billion, five hundred twelve million, sixty-five thousand, nine hundred twenty".