1209210049 has 2 divisors, whose sum is σ = 1209210050. Its totient is φ = 1209210048.

The previous prime is 1209210047. The next prime is 1209210097. The reversal of 1209210049 is 9400129021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085043600 + 124166449 = 32940^2 + 11143^2 .

It is an emirp because it is prime and its reverse (9400129021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1209210049 - 2¹ = 1209210047 is a prime.

Together with 1209210047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1209209999 and 1209210026.

It is not a weakly prime, because it can be changed into another prime (1209210043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604605024 + 604605025.

It is an arithmetic number, because the mean of its divisors is an integer number (604605025).

Almost surely, 2^1209210049 is an apocalyptic number.

It is an amenable number.

1209210049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209210049 is an equidigital number, since it uses as much as digits as its factorization.

1209210049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1209210049 is about 34773.6976607320. The cubic root of 1209210049 is about 1065.3702927436.

The spelling of 1209210049 in words is "one billion, two hundred nine million, two hundred ten thousand, forty-nine".