245143057 has 4 divisors (see below), whose sum is σ = 246387636. Its totient is φ = 243898480.

The previous prime is 245143037. The next prime is 245143069. The reversal of 245143057 is 750341542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750341542 = 2 ⋅375170771.

It can be written as a sum of positive squares in 2 ways, for example, as 242611776 + 2531281 = 15576^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 245143057 - 2¹⁹ = 244618769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245143037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621994 + ... + 622387.

It is an arithmetic number, because the mean of its divisors is an integer number (61596909).

Almost surely, 2^245143057 is an apocalyptic number.

It is an amenable number.

245143057 is a deficient number, since it is larger than the sum of its proper divisors (1244579).

245143057 is a wasteful number, since it uses less digits than its factorization.

245143057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244578.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 245143057 is about 15657.0449638493. The cubic root of 245143057 is about 625.8542405450.

Adding to 245143057 its reverse (750341542), we get a palindrome (995484599).

The spelling of 245143057 in words is "two hundred forty-five million, one hundred forty-three thousand, fifty-seven".