245140247 has 4 divisors (see below), whose sum is σ = 267425736. Its totient is φ = 222854760.

The previous prime is 245140241. The next prime is 245140249. The reversal of 245140247 is 742041542.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245140247 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 (245140241) 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, 11142728 + ... + 11142749.

It is an arithmetic number, because the mean of its divisors is an integer number (66856434).

Almost surely, 2^245140247 is an apocalyptic number.

245140247 is a deficient number, since it is larger than the sum of its proper divisors (22285489).

245140247 is a wasteful number, since it uses less digits than its factorization.

245140247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22285488.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 245140247 is about 15656.9552276297. The cubic root of 245140247 is about 625.8518492105.

Adding to 245140247 its reverse (742041542), we get a palindrome (987181789).

The spelling of 245140247 in words is "two hundred forty-five million, one hundred forty thousand, two hundred forty-seven".