1222157 has 2 divisors, whose sum is σ = 1222158. Its totient is φ = 1222156.

The previous prime is 1222129. The next prime is 1222159. The reversal of 1222157 is 7512221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978121 + 244036 = 989^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222157 - 2¹⁴ = 1205773 is a prime.

Together with 1222159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611078 + 611079.

It is an arithmetic number, because the mean of its divisors is an integer number (611079).

2^1222157 is an apocalyptic number.

It is an amenable number.

1222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222157 is an equidigital number, since it uses as much as digits as its factorization.

1222157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 20.

The square root of 1222157 is about 1105.5120985317. The cubic root of 1222157 is about 106.9159091250.

Adding to 1222157 its reverse (7512221), we get a palindrome (8734378).

Subtracting 1222157 from its reverse (7512221), we obtain a square (6290064 = 2508²).

The spelling of 1222157 in words is "one million, two hundred twenty-two thousand, one hundred fifty-seven".