1545155521 has 16 divisors (see below), whose sum is σ = 1905523200. Its totient is φ = 1220102208.

The previous prime is 1545155477. The next prime is 1545155539. The reversal of 1545155521 is 1255515451.

It is not a de Polignac number, because 1545155521 - 2⁷ = 1545155393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1545155581) 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, 29640 + ... + 62998.

It is an arithmetic number, because the mean of its divisors is an integer number (119095200).

Almost surely, 2^1545155521 is an apocalyptic number.

It is an amenable number.

1545155521 is a deficient number, since it is larger than the sum of its proper divisors (360367679).

1545155521 is a wasteful number, since it uses less digits than its factorization.

1545155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33888.

The product of its digits is 25000, while the sum is 34.

The square root of 1545155521 is about 39308.4662763634. The cubic root of 1545155521 is about 1156.0875723879.

The spelling of 1545155521 in words is "one billion, five hundred forty-five million, one hundred fifty-five thousand, five hundred twenty-one".