11531533851 has 12 divisors (see below), whose sum is σ = 17380862928. Its totient is φ = 7353441744.

The previous prime is 11531533787. The next prime is 11531533877. The reversal of 11531533851 is 15833513511.

11531533851 is a `hidden beast` number, since 1 + 1 + 5 + 315 + 338 + 5 + 1 = 666.

It is not a de Polignac number, because 11531533851 - 2⁶ = 11531533787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11531532851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27853740 + ... + 27854153.

It is an arithmetic number, because the mean of its divisors is an integer number (1448405244).

Almost surely, 2^11531533851 is an apocalyptic number.

11531533851 is a deficient number, since it is larger than the sum of its proper divisors (5849329077).

11531533851 is a wasteful number, since it uses less digits than its factorization.

11531533851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55707922 (or 55707919 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 11531533851 in words is "eleven billion, five hundred thirty-one million, five hundred thirty-three thousand, eight hundred fifty-one".