245755021 has 4 divisors (see below), whose sum is σ = 245821500. Its totient is φ = 245688544.

The previous prime is 245754991. The next prime is 245755039. The reversal of 245755021 is 120557542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162690025 + 83064996 = 12755^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 245755021 - 2⁷ = 245754893 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 (245755051) 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, 27346 + ... + 35203.

It is an arithmetic number, because the mean of its divisors is an integer number (61455375).

Almost surely, 2^245755021 is an apocalyptic number.

It is an amenable number.

245755021 is a deficient number, since it is larger than the sum of its proper divisors (66479).

245755021 is an equidigital number, since it uses as much as digits as its factorization.

245755021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66478.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 245755021 is about 15676.5755508019. The cubic root of 245755021 is about 626.3745924964.

The spelling of 245755021 in words is "two hundred forty-five million, seven hundred fifty-five thousand, twenty-one".