245605247 has 4 divisors (see below), whose sum is σ = 256283760. Its totient is φ = 234926736.

The previous prime is 245605237. The next prime is 245605249. The reversal of 245605247 is 742506542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245605247 - 2¹⁰ = 245604223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245605249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5339222 + ... + 5339267.

It is an arithmetic number, because the mean of its divisors is an integer number (64070940).

Almost surely, 2^245605247 is an apocalyptic number.

245605247 is a deficient number, since it is larger than the sum of its proper divisors (10678513).

245605247 is a wasteful number, since it uses less digits than its factorization.

245605247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10678512.

The product of its (nonzero) digits is 67200, while the sum is 35.

The square root of 245605247 is about 15671.7978228409. The cubic root of 245605247 is about 626.2473198266.

The spelling of 245605247 in words is "two hundred forty-five million, six hundred five thousand, two hundred forty-seven".