15131540 has 24 divisors (see below), whose sum is σ = 32010720. Its totient is φ = 6007968.

The previous prime is 15131531. The next prime is 15131549. The reversal of 15131540 is 4513151.

It is an interprime number because it is at equal distance from previous prime (15131531) and next prime (15131549).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15131549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (1333780).

Almost surely, 2^15131540 is an apocalyptic number.

15131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15131540 is an abundant number, since it is smaller than the sum of its proper divisors (16879180).

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

15131540 is a wasteful number, since it uses less digits than its factorization.

15131540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591 (or 5589 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 15131540 is about 3889.9280198996. The cubic root of 15131540 is about 247.3400115571.

Adding to 15131540 its reverse (4513151), we get a palindrome (19644691).

The spelling of 15131540 in words is "fifteen million, one hundred thirty-one thousand, five hundred forty".