245153509 has 2 divisors, whose sum is σ = 245153510. Its totient is φ = 245153508.

The previous prime is 245153507. The next prime is 245153521. The reversal of 245153509 is 905351542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244828609 + 324900 = 15647^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 245153509 - 2¹ = 245153507 is a prime.

Together with 245153507, it forms a pair of twin primes.

It is equal to p_13428628 and since 245153509 and 13428628 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245153507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122576754 + 122576755.

It is an arithmetic number, because the mean of its divisors is an integer number (122576755).

Almost surely, 2^245153509 is an apocalyptic number.

It is an amenable number.

245153509 is a deficient number, since it is larger than the sum of its proper divisors (1).

245153509 is an equidigital number, since it uses as much as digits as its factorization.

245153509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 245153509 is about 15657.3787397508. The cubic root of 245153509 is about 625.8631351277.

The spelling of 245153509 in words is "two hundred forty-five million, one hundred fifty-three thousand, five hundred nine".