245315251 has 4 divisors (see below), whose sum is σ = 258226600. Its totient is φ = 232403904.

The previous prime is 245315227. The next prime is 245315261. The reversal of 245315251 is 152513542.

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 245315251 - 2¹⁵ = 245282483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245315261) 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, 6455646 + ... + 6455683.

It is an arithmetic number, because the mean of its divisors is an integer number (64556650).

Almost surely, 2^245315251 is an apocalyptic number.

245315251 is a deficient number, since it is larger than the sum of its proper divisors (12911349).

245315251 is a wasteful number, since it uses less digits than its factorization.

245315251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12911348.

The product of its digits is 6000, while the sum is 28.

The square root of 245315251 is about 15662.5429289116. The cubic root of 245315251 is about 626.0007442822. Note that the first 3 decimals are identical.

Adding to 245315251 its reverse (152513542), we get a palindrome (397828793).

The spelling of 245315251 in words is "two hundred forty-five million, three hundred fifteen thousand, two hundred fifty-one".