245143517 has 4 divisors (see below), whose sum is σ = 246767136. Its totient is φ = 243519900.

The previous prime is 245143511. The next prime is 245143531. The reversal of 245143517 is 715341542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 715341542 = 2 ⋅357670771.

It is a cyclic number.

It is not a de Polignac number, because 245143517 - 2¹⁰ = 245142493 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 (245143511) 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, 811583 + ... + 811884.

It is an arithmetic number, because the mean of its divisors is an integer number (61691784).

Almost surely, 2^245143517 is an apocalyptic number.

It is an amenable number.

245143517 is a deficient number, since it is larger than the sum of its proper divisors (1623619).

245143517 is a wasteful number, since it uses less digits than its factorization.

245143517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623618.

The product of its digits is 16800, while the sum is 32.

The square root of 245143517 is about 15657.0596537153. The cubic root of 245143517 is about 625.8546320073.

The spelling of 245143517 in words is "two hundred forty-five million, one hundred forty-three thousand, five hundred seventeen".