245404121 has 4 divisors (see below), whose sum is σ = 245579700. Its totient is φ = 245228544.

The previous prime is 245404111. The next prime is 245404123. The reversal of 245404121 is 121404542.

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 101284096 + 144120025 = 10064^2 + 12005^2 .

It is a cyclic number.

It is not a de Polignac number, because 245404121 - 2²² = 241209817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245404123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85676 + ... + 88493.

It is an arithmetic number, because the mean of its divisors is an integer number (61394925).

Almost surely, 2^245404121 is an apocalyptic number.

It is an amenable number.

245404121 is a deficient number, since it is larger than the sum of its proper divisors (175579).

245404121 is a wasteful number, since it uses less digits than its factorization.

245404121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175578.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 245404121 is about 15665.3796953665. The cubic root of 245404121 is about 626.0763286160.

Adding to 245404121 its reverse (121404542), we get a palindrome (366808663).

The spelling of 245404121 in words is "two hundred forty-five million, four hundred four thousand, one hundred twenty-one".