245260721 has 8 divisors (see below), whose sum is σ = 259756320. Its totient is φ = 230923872.

The previous prime is 245260651. The next prime is 245260723. The reversal of 245260721 is 127062542.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-245260721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245260723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36500 + ... + 42693.

It is an arithmetic number, because the mean of its divisors is an integer number (32469540).

Almost surely, 2^245260721 is an apocalyptic number.

It is an amenable number.

245260721 is a deficient number, since it is larger than the sum of its proper divisors (14495599).

245260721 is a wasteful number, since it uses less digits than its factorization.

245260721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79375.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 245260721 is about 15660.8020548119. The cubic root of 245260721 is about 625.9543572352.

The spelling of 245260721 in words is "two hundred forty-five million, two hundred sixty thousand, seven hundred twenty-one".