531121511320 has 64 divisors (see below), whose sum is σ = 1199869704000. Its totient is φ = 211588692480.

The previous prime is 531121511309. The next prime is 531121511339. The reversal of 531121511320 is 23115121135.

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, 10471381 + ... + 10521979.

It is an arithmetic number, because the mean of its divisors is an integer number (18747964125).

Almost surely, 2^531121511320 is an apocalyptic number.

It is an amenable number.

531121511320 is an abundant number, since it is smaller than the sum of its proper divisors (668748192680).

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

531121511320 is a wasteful number, since it uses less digits than its factorization.

531121511320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51668 (or 51664 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 531121511320 its reverse (23115121135), we get a palindrome (554236632455).

It can be divided in two parts, 531121 and 511320, that added together give a square (1042441 = 1021²).

The spelling of 531121511320 in words is "five hundred thirty-one billion, one hundred twenty-one million, five hundred eleven thousand, three hundred twenty".