1125551 has 8 divisors (see below), whose sum is σ = 1342464. Its totient is φ = 922680.

The previous prime is 1125539. The next prime is 1125557. The reversal of 1125551 is 1555211.

It is a happy number.

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 1125551 - 2¹⁴ = 1109167 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125557) 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, 3335 + ... + 3656.

It is an arithmetic number, because the mean of its divisors is an integer number (167808).

2^1125551 is an apocalyptic number.

1125551 is a deficient number, since it is larger than the sum of its proper divisors (216913).

1125551 is an equidigital number, since it uses as much as digits as its factorization.

1125551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021.

The product of its digits is 250, while the sum is 20.

The square root of 1125551 is about 1060.9198838744. The cubic root of 1125551 is about 104.0211680285.

The spelling of 1125551 in words is "one million, one hundred twenty-five thousand, five hundred fifty-one".