1551563 has 12 divisors (see below), whose sum is σ = 1736784. Its totient is φ = 1377600.

The previous prime is 1551551. The next prime is 1551577. The reversal of 1551563 is 3651551.

It is not a de Polignac number, because 1551563 - 2⁶ = 1551499 is a prime.

It is a Duffinian number.

Its product of digits (2250) is a multiple of the sum of its prime divisors (125).

It is not an unprimeable number, because it can be changed into a prime (1551593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21818 + ... + 21888.

It is an arithmetic number, because the mean of its divisors is an integer number (144732).

2^1551563 is an apocalyptic number.

1551563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1551563 is a deficient number, since it is larger than the sum of its proper divisors (185221).

1551563 is an equidigital number, since it uses as much as digits as its factorization.

1551563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 125 counting only the distinct ones).

The product of its digits is 2250, while the sum is 26.

The square root of 1551563 is about 1245.6175175390. The cubic root of 1551563 is about 115.7683396871.

The spelling of 1551563 in words is "one million, five hundred fifty-one thousand, five hundred sixty-three".