1220199857 has 2 divisors, whose sum is σ = 1220199858. Its totient is φ = 1220199856.

The previous prime is 1220199791. The next prime is 1220199899. The reversal of 1220199857 is 7589910221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208883361 + 11316496 = 34769^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220199857 - 2⁸ = 1220199601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220199457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610099928 + 610099929.

It is an arithmetic number, because the mean of its divisors is an integer number (610099929).

Almost surely, 2^1220199857 is an apocalyptic number.

It is an amenable number.

1220199857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220199857 is an equidigital number, since it uses as much as digits as its factorization.

1220199857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1220199857 is about 34931.3592206201. The cubic root of 1220199857 is about 1068.5880748172.

The spelling of 1220199857 in words is "one billion, two hundred twenty million, one hundred ninety-nine thousand, eight hundred fifty-seven".