1209985057 has 2 divisors, whose sum is σ = 1209985058. Its totient is φ = 1209985056.

The previous prime is 1209985043. The next prime is 1209985069. The reversal of 1209985057 is 7505899021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042256656 + 167728401 = 32284^2 + 12951^2 .

It is an emirp because it is prime and its reverse (7505899021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209985057 - 2⁷ = 1209984929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1209984998 and 1209985016.

It is not a weakly prime, because it can be changed into another prime (1209985097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604992528 + 604992529.

It is an arithmetic number, because the mean of its divisors is an integer number (604992529).

Almost surely, 2^1209985057 is an apocalyptic number.

It is an amenable number.

1209985057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209985057 is an equidigital number, since it uses as much as digits as its factorization.

1209985057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 1209985057 is about 34784.8394706660. The cubic root of 1209985057 is about 1065.5978501661.

The spelling of 1209985057 in words is "one billion, two hundred nine million, nine hundred eighty-five thousand, fifty-seven".