1544131540 has 48 divisors (see below), whose sum is σ = 3732624000. Its totient is φ = 525601152.

The previous prime is 1544131517. The next prime is 1544131541. The reversal of 1544131540 is 451314451.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1544131499 and 1544131508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1544131541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20215 + ... + 59134.

It is an arithmetic number, because the mean of its divisors is an integer number (77763000).

Almost surely, 2^1544131540 is an apocalyptic number.

1544131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1544131540 is an abundant number, since it is smaller than the sum of its proper divisors (2188492460).

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

1544131540 is a wasteful number, since it uses less digits than its factorization.

1544131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79504 (or 79502 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1544131540 is about 39295.4391755583. The cubic root of 1544131540 is about 1155.8321346030.

Adding to 1544131540 its reverse (451314451), we get a palindrome (1995445991).

The spelling of 1544131540 in words is "one billion, five hundred forty-four million, one hundred thirty-one thousand, five hundred forty".