1211251 has 4 divisors (see below), whose sum is σ = 1218672. Its totient is φ = 1203832.

The previous prime is 1211227. The next prime is 1211261. The reversal of 1211251 is 1521121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211251 - 2¹⁵ = 1178483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211261) 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 3 ways as a sum of consecutive naturals, for example, 3460 + ... + 3793.

It is an arithmetic number, because the mean of its divisors is an integer number (304668).

2^1211251 is an apocalyptic number.

1211251 is a deficient number, since it is larger than the sum of its proper divisors (7421).

1211251 is an equidigital number, since it uses as much as digits as its factorization.

1211251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7420.

The product of its digits is 20, while the sum is 13.

The square root of 1211251 is about 1100.5684894635. The cubic root of 1211251 is about 106.5969346753.

Adding to 1211251 its reverse (1521121), we get a palindrome (2732372).

The spelling of 1211251 in words is "one million, two hundred eleven thousand, two hundred fifty-one".