245285521 has 4 divisors (see below), whose sum is σ = 264153652. Its totient is φ = 226417392.

The previous prime is 245285507. The next prime is 245285561. The reversal of 245285521 is 125582542.

245285521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125582542 = 2 ⋅62791271.

It can be written as a sum of positive squares in 2 ways, for example, as 46785600 + 198499921 = 6840^2 + 14089^2 .

It is a cyclic number.

It is not a de Polignac number, because 245285521 - 2⁵ = 245285489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245285561) 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, 9434046 + ... + 9434071.

It is an arithmetic number, because the mean of its divisors is an integer number (66038413).

Almost surely, 2^245285521 is an apocalyptic number.

It is an amenable number.

245285521 is a deficient number, since it is larger than the sum of its proper divisors (18868131).

245285521 is a wasteful number, since it uses less digits than its factorization.

245285521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18868130.

The product of its digits is 32000, while the sum is 34.

The square root of 245285521 is about 15661.5938205535. The cubic root of 245285521 is about 625.9754547090.

The spelling of 245285521 in words is "two hundred forty-five million, two hundred eighty-five thousand, five hundred twenty-one".