245312009 has 2 divisors, whose sum is σ = 245312010. Its totient is φ = 245312008.

The previous prime is 245311949. The next prime is 245312027. The reversal of 245312009 is 900213542.

245312009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239382784 + 5929225 = 15472^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 245312009 - 2¹² = 245307913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245315009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122656004 + 122656005.

It is an arithmetic number, because the mean of its divisors is an integer number (122656005).

Almost surely, 2^245312009 is an apocalyptic number.

It is an amenable number.

245312009 is a deficient number, since it is larger than the sum of its proper divisors (1).

245312009 is an equidigital number, since it uses as much as digits as its factorization.

245312009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 245312009 is about 15662.4394332428. The cubic root of 245312009 is about 625.9979866015.

The spelling of 245312009 in words is "two hundred forty-five million, three hundred twelve thousand, nine".