245849521 has 4 divisors (see below), whose sum is σ = 247785472. Its totient is φ = 243913572.

The previous prime is 245849509. The next prime is 245849557. The reversal of 245849521 is 125948542.

It is a happy number.

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: 125948542 = 2 ⋅62974271.

It is a cyclic number.

It is not a de Polignac number, because 245849521 - 2¹¹ = 245847473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245849221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967785 + ... + 968038.

It is an arithmetic number, because the mean of its divisors is an integer number (61946368).

Almost surely, 2^245849521 is an apocalyptic number.

It is an amenable number.

245849521 is a deficient number, since it is larger than the sum of its proper divisors (1935951).

245849521 is a wasteful number, since it uses less digits than its factorization.

245849521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935950.

The product of its digits is 115200, while the sum is 40.

The square root of 245849521 is about 15679.5893122237. The cubic root of 245849521 is about 626.4548686637.

The spelling of 245849521 in words is "two hundred forty-five million, eight hundred forty-nine thousand, five hundred twenty-one".