1111221157 has 2 divisors, whose sum is σ = 1111221158. Its totient is φ = 1111221156.

The previous prime is 1111221119. The next prime is 1111221187. The reversal of 1111221157 is 7511221111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 886491076 + 224730081 = 29774^2 + 14991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111221157 - 2⁷ = 1111221029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555610578 + 555610579.

It is an arithmetic number, because the mean of its divisors is an integer number (555610579).

Almost surely, 2^1111221157 is an apocalyptic number.

It is an amenable number.

1111221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111221157 is an equidigital number, since it uses as much as digits as its factorization.

1111221157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140, while the sum is 22.

The square root of 1111221157 is about 33334.9839807971. The cubic root of 1111221157 is about 1035.7783613388.

Adding to 1111221157 its reverse (7511221111), we get a palindrome (8622442268).

The spelling of 1111221157 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred fifty-seven".