1211151 has 4 divisors (see below), whose sum is σ = 1614872. Its totient is φ = 807432.

The previous prime is 1211141. The next prime is 1211167. The reversal of 1211151 is 1511121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1511121 = 3 ⋅503707.

It is not a de Polignac number, because 1211151 - 2⁶ = 1211087 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211141) 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, 201856 + ... + 201861.

It is an arithmetic number, because the mean of its divisors is an integer number (403718).

2^1211151 is an apocalyptic number.

1211151 is a deficient number, since it is larger than the sum of its proper divisors (403721).

1211151 is an equidigital number, since it uses as much as digits as its factorization.

1211151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403720.

The product of its digits is 10, while the sum is 12.

The square root of 1211151 is about 1100.5230574595. The cubic root of 1211151 is about 106.5940010728.

Adding to 1211151 its reverse (1511121), we get a palindrome (2722272).

The spelling of 1211151 in words is "one million, two hundred eleven thousand, one hundred fifty-one".