245241509 has 2 divisors, whose sum is σ = 245241510. Its totient is φ = 245241508.

The previous prime is 245241497. The next prime is 245241523. The reversal of 245241509 is 905142542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127193284 + 118048225 = 11278^2 + 10865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245241509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245241109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122620754 + 122620755.

It is an arithmetic number, because the mean of its divisors is an integer number (122620755).

Almost surely, 2^245241509 is an apocalyptic number.

It is an amenable number.

245241509 is a deficient number, since it is larger than the sum of its proper divisors (1).

245241509 is an equidigital number, since it uses as much as digits as its factorization.

245241509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 245241509 is about 15660.1886642531. The cubic root of 245241509 is about 625.9380125211.

The spelling of 245241509 in words is "two hundred forty-five million, two hundred forty-one thousand, five hundred nine".