1563900385 has 4 divisors (see below), whose sum is σ = 1876680468. Its totient is φ = 1251120304.

The previous prime is 1563900379. The next prime is 1563900413. The reversal of 1563900385 is 5830093651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5830093651 = 53 ⋅110001767.

It can be written as a sum of positive squares in 2 ways, for example, as 608904976 + 954995409 = 24676^2 + 30903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1563900385 - 2¹⁷ = 1563769313 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156390034 + ... + 156390043.

It is an arithmetic number, because the mean of its divisors is an integer number (469170117).

Almost surely, 2^1563900385 is an apocalyptic number.

It is an amenable number.

1563900385 is a deficient number, since it is larger than the sum of its proper divisors (312780083).

1563900385 is an equidigital number, since it uses as much as digits as its factorization.

1563900385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312780082.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 1563900385 is about 39546.1804097437. The cubic root of 1563900385 is about 1160.7437721618.

The spelling of 1563900385 in words is "one billion, five hundred sixty-three million, nine hundred thousand, three hundred eighty-five".