1211157 has 12 divisors (see below), whose sum is σ = 1825824. Its totient is φ = 772200.

The previous prime is 1211141. The next prime is 1211167. The reversal of 1211157 is 7511121.

It is a happy number.

It is not a de Polignac number, because 1211157 - 2⁴ = 1211141 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 (1211167) 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 11 ways as a sum of consecutive naturals, for example, 2719 + ... + 3132.

It is an arithmetic number, because the mean of its divisors is an integer number (152152).

2^1211157 is an apocalyptic number.

It is an amenable number.

1211157 is a deficient number, since it is larger than the sum of its proper divisors (614667).

1211157 is a wasteful number, since it uses less digits than its factorization.

1211157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5880 (or 5877 counting only the distinct ones).

The product of its digits is 70, while the sum is 18.

The square root of 1211157 is about 1100.5257834326. The cubic root of 1211157 is about 106.5941770935.

Adding to 1211157 its reverse (7511121), we get a palindrome (8722278).

The spelling of 1211157 in words is "one million, two hundred eleven thousand, one hundred fifty-seven".