245409681 has 16 divisors (see below), whose sum is σ = 375747840. Its totient is φ = 140904720.

The previous prime is 245409679. The next prime is 245409707. The reversal of 245409681 is 186904542.

It is not a de Polignac number, because 245409681 - 2¹ = 245409679 is a prime.

It is a super-2 number, since 2×245409681² = 120451823057043522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245409611) 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 15 ways as a sum of consecutive naturals, for example, 195075 + ... + 196328.

It is an arithmetic number, because the mean of its divisors is an integer number (23484240).

Almost surely, 2^245409681 is an apocalyptic number.

It is an amenable number.

245409681 is a deficient number, since it is larger than the sum of its proper divisors (130338159).

245409681 is a wasteful number, since it uses less digits than its factorization.

245409681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391436.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 245409681 is about 15665.5571557478. The cubic root of 245409681 is about 626.0810568144.

The spelling of 245409681 in words is "two hundred forty-five million, four hundred nine thousand, six hundred eighty-one".