245187009 has 6 divisors (see below), whose sum is σ = 354159026. Its totient is φ = 163458000.

The previous prime is 245186959. The next prime is 245187017. The reversal of 245187009 is 900781542.

It can be written as a sum of positive squares in only one way, i.e., 166332609 + 78854400 = 12897^2 + 8880^2 .

It is not a de Polignac number, because 245187009 - 2¹⁵ = 245154241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245187409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13621492 + ... + 13621509.

Almost surely, 2^245187009 is an apocalyptic number.

It is an amenable number.

245187009 is a deficient number, since it is larger than the sum of its proper divisors (108972017).

245187009 is a wasteful number, since it uses less digits than its factorization.

245187009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27243007 (or 27243004 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 245187009 is about 15658.4484863603. The cubic root of 245187009 is about 625.8916417019.

The spelling of 245187009 in words is "two hundred forty-five million, one hundred eighty-seven thousand, nine".