1545531638 has 12 divisors (see below), whose sum is σ = 2696795172. Its totient is φ = 662370660.

The previous prime is 1545531587. The next prime is 1545531653. The reversal of 1545531638 is 8361355451.

It is a junction number, because it is equal to n+sod(n) for n = 1545531595 and 1545531604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7885268 + ... + 7885463.

It is an arithmetic number, because the mean of its divisors is an integer number (224732931).

Almost surely, 2^1545531638 is an apocalyptic number.

1545531638 is a deficient number, since it is larger than the sum of its proper divisors (1151263534).

1545531638 is a wasteful number, since it uses less digits than its factorization.

1545531638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15770747 (or 15770740 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The square root of 1545531638 is about 39313.2501581846. The cubic root of 1545531638 is about 1156.1813685370.

The spelling of 1545531638 in words is "one billion, five hundred forty-five million, five hundred thirty-one thousand, six hundred thirty-eight".