1200020257 has 2 divisors, whose sum is σ = 1200020258. Its totient is φ = 1200020256.

The previous prime is 1200020233. The next prime is 1200020273. The reversal of 1200020257 is 7520200021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176215616 + 23804641 = 34296^2 + 4879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200020257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200020287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010128 + 600010129.

It is an arithmetic number, because the mean of its divisors is an integer number (600010129).

Almost surely, 2^1200020257 is an apocalyptic number.

It is an amenable number.

1200020257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200020257 is an equidigital number, since it uses as much as digits as its factorization.

1200020257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 1200020257 is about 34641.3085347537. The cubic root of 1200020257 is about 1062.6645486697.

Adding to 1200020257 its reverse (7520200021), we get a palindrome (8720220278).

The spelling of 1200020257 in words is "one billion, two hundred million, twenty thousand, two hundred fifty-seven".