245018309 has 2 divisors, whose sum is σ = 245018310. Its totient is φ = 245018308.

The previous prime is 245018299. The next prime is 245018317. The reversal of 245018309 is 903810542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226502500 + 18515809 = 15050^2 + 4303^2 .

It is a cyclic number.

It is not a de Polignac number, because 245018309 - 2²⁴ = 228241093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245017309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122509154 + 122509155.

It is an arithmetic number, because the mean of its divisors is an integer number (122509155).

Almost surely, 2^245018309 is an apocalyptic number.

It is an amenable number.

245018309 is a deficient number, since it is larger than the sum of its proper divisors (1).

245018309 is an equidigital number, since it uses as much as digits as its factorization.

245018309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 245018309 is about 15653.0606911236. The cubic root of 245018309 is about 625.7480613030.

The spelling of 245018309 in words is "two hundred forty-five million, eighteen thousand, three hundred nine".