11531021516 has 48 divisors (see below), whose sum is σ = 23899072512. Its totient is φ = 4763750400.

The previous prime is 11531021461. The next prime is 11531021521. The reversal of 11531021516 is 61512013511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197231 + ... + 248921.

It is an arithmetic number, because the mean of its divisors is an integer number (497897344).

Almost surely, 2^11531021516 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 11531021516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11949536256).

11531021516 is an abundant number, since it is smaller than the sum of its proper divisors (12368050996).

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

11531021516 is a wasteful number, since it uses less digits than its factorization.

11531021516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51990 (or 51988 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 26.

The spelling of 11531021516 in words is "eleven billion, five hundred thirty-one million, twenty-one thousand, five hundred sixteen".