1121551 has 4 divisors (see below), whose sum is σ = 1180600. Its totient is φ = 1062504.

The previous prime is 1121543. The next prime is 1121557. The reversal of 1121551 is 1551211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551211 = 337 ⋅4603.

It is a cyclic number.

It is not a de Polignac number, because 1121551 - 2³ = 1121543 is a prime.

It is a Duffinian number.

1121551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29496 + ... + 29533.

It is an arithmetic number, because the mean of its divisors is an integer number (295150).

2^1121551 is an apocalyptic number.

1121551 is a deficient number, since it is larger than the sum of its proper divisors (59049).

1121551 is an equidigital number, since it uses as much as digits as its factorization.

1121551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59048.

The product of its digits is 50, while the sum is 16.

The square root of 1121551 is about 1059.0330495315. The cubic root of 1121551 is about 103.8977977729.

Adding to 1121551 its reverse (1551211), we get a palindrome (2672762).

The spelling of 1121551 in words is "one million, one hundred twenty-one thousand, five hundred fifty-one".