245342509 has 2 divisors, whose sum is σ = 245342510. Its totient is φ = 245342508.

The previous prime is 245342441. The next prime is 245342519. The reversal of 245342509 is 905243542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207273609 + 38068900 = 14397^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 245342509 - 2⁹ = 245341997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245342519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122671254 + 122671255.

It is an arithmetic number, because the mean of its divisors is an integer number (122671255).

Almost surely, 2^245342509 is an apocalyptic number.

It is an amenable number.

245342509 is a deficient number, since it is larger than the sum of its proper divisors (1).

245342509 is an equidigital number, since it uses as much as digits as its factorization.

245342509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 245342509 is about 15663.4130699538. The cubic root of 245342509 is about 626.0239292741.

The spelling of 245342509 in words is "two hundred forty-five million, three hundred forty-two thousand, five hundred nine".