1538890561 has 8 divisors (see below), whose sum is σ = 1710727424. Its totient is φ = 1374690960.

The previous prime is 1538890559. The next prime is 1538890571. The reversal of 1538890561 is 1650988351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1538890561 - 2¹ = 1538890559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538890571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1908891 + ... + 1909696.

It is an arithmetic number, because the mean of its divisors is an integer number (213840928).

Almost surely, 2^1538890561 is an apocalyptic number.

It is an amenable number.

1538890561 is a deficient number, since it is larger than the sum of its proper divisors (171836863).

1538890561 is a wasteful number, since it uses less digits than its factorization.

1538890561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818631.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 1538890561 is about 39228.6956321517. The cubic root of 1538890561 is about 1154.5229718652.

The spelling of 1538890561 in words is "one billion, five hundred thirty-eight million, eight hundred ninety thousand, five hundred sixty-one".