245142251 has 4 divisors (see below), whose sum is σ = 247569504. Its totient is φ = 242715000.

The previous prime is 245142187. The next prime is 245142253. The reversal of 245142251 is 152241542.

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 245142251 - 2⁶ = 245142187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245142251.

It is not an unprimeable number, because it can be changed into a prime (245142253) 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, 1213475 + ... + 1213676.

It is an arithmetic number, because the mean of its divisors is an integer number (61892376).

Almost surely, 2^245142251 is an apocalyptic number.

245142251 is a deficient number, since it is larger than the sum of its proper divisors (2427253).

245142251 is a wasteful number, since it uses less digits than its factorization.

245142251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427252.

The product of its digits is 3200, while the sum is 26.

The square root of 245142251 is about 15657.0192246162. The cubic root of 245142251 is about 625.8535546339.

Adding to 245142251 its reverse (152241542), we get a palindrome (397383793).

The spelling of 245142251 in words is "two hundred forty-five million, one hundred forty-two thousand, two hundred fifty-one".