1228222157 has 2 divisors, whose sum is σ = 1228222158. Its totient is φ = 1228222156.

The previous prime is 1228222087. The next prime is 1228222169. The reversal of 1228222157 is 7512228221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192389961 + 35832196 = 34531^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228222157 - 2⁸ = 1228221901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228222657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614111078 + 614111079.

It is an arithmetic number, because the mean of its divisors is an integer number (614111079).

Almost surely, 2^1228222157 is an apocalyptic number.

It is an amenable number.

1228222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228222157 is an equidigital number, since it uses as much as digits as its factorization.

1228222157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 32.

The square root of 1228222157 is about 35046.0005849455. Note that the first 3 decimals coincide. The cubic root of 1228222157 is about 1070.9248000815.

The spelling of 1228222157 in words is "one billion, two hundred twenty-eight million, two hundred twenty-two thousand, one hundred fifty-seven".