15131181852 has 18 divisors (see below), whose sum is σ = 38248265328. Its totient is φ = 5043727272.

The previous prime is 15131181803. The next prime is 15131181853. The reversal of 15131181852 is 25818113151.

15131181852 is a `hidden beast` number, since 1 + 513 + 11 + 81 + 8 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×15131181852³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 420310607 = 15131181852 / (1 + 5 + 1 + 3 + 1 + 1 + 8 + 1 + 8 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15131181853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210155268 + ... + 210155339.

Almost surely, 2^15131181852 is an apocalyptic number.

15131181852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15131181852 is an abundant number, since it is smaller than the sum of its proper divisors (23117083476).

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

15131181852 is a wasteful number, since it uses less digits than its factorization.

15131181852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420310617 (or 420310612 counting only the distinct ones).

The product of its digits is 9600, while the sum is 36.

The spelling of 15131181852 in words is "fifteen billion, one hundred thirty-one million, one hundred eighty-one thousand, eight hundred fifty-two".