1251563 has 8 divisors (see below), whose sum is σ = 1320960. Its totient is φ = 1184040.

The previous prime is 1251533. The next prime is 1251571. The reversal of 1251563 is 3651521.

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 1251563 - 2⁸ = 1251307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028 + ... + 1886.

It is an arithmetic number, because the mean of its divisors is an integer number (165120).

2^1251563 is an apocalyptic number.

1251563 is a deficient number, since it is larger than the sum of its proper divisors (69397).

1251563 is an equidigital number, since it uses as much as digits as its factorization.

1251563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937.

The product of its digits is 900, while the sum is 23.

The square root of 1251563 is about 1118.7327652304. The cubic root of 1251563 is about 107.7666142199.

The spelling of 1251563 in words is "one million, two hundred fifty-one thousand, five hundred sixty-three".