245056521 has 4 divisors (see below), whose sum is σ = 326742032. Its totient is φ = 163371012.

The previous prime is 245056517. The next prime is 245056531. The reversal of 245056521 is 125650542.

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.

It is not a de Polignac number, because 245056521 - 2² = 245056517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245056501) 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, 40842751 + ... + 40842756.

It is an arithmetic number, because the mean of its divisors is an integer number (81685508).

Almost surely, 2^245056521 is an apocalyptic number.

It is an amenable number.

245056521 is a deficient number, since it is larger than the sum of its proper divisors (81685511).

245056521 is an equidigital number, since it uses as much as digits as its factorization.

245056521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81685510.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 245056521 is about 15654.2812354959. The cubic root of 245056521 is about 625.7805892694.

The spelling of 245056521 in words is "two hundred forty-five million, fifty-six thousand, five hundred twenty-one".