15531132540 has 192 divisors, whose sum is σ = 54318781440. Its totient is φ = 3221237760.

The previous prime is 15531132499. The next prime is 15531132569. The reversal of 15531132540 is 4523113551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15531132498 and 15531132507.

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, 2736826 + ... + 2742494.

It is an arithmetic number, because the mean of its divisors is an integer number (282910320).

Almost surely, 2^15531132540 is an apocalyptic number.

15531132540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15531132540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27159390720).

15531132540 is an abundant number, since it is smaller than the sum of its proper divisors (38787648900).

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

15531132540 is a wasteful number, since it uses less digits than its factorization.

15531132540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292 (or 6290 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 15531132540 in words is "fifteen billion, five hundred thirty-one million, one hundred thirty-two thousand, five hundred forty".