245421161 has 4 divisors (see below), whose sum is σ = 245754000. Its totient is φ = 245088324.

The previous prime is 245421131. The next prime is 245421181. The reversal of 245421161 is 161124542.

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 a cyclic number.

It is not a de Polignac number, because 245421161 - 2⁶ = 245421097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 245421161.

It is not an unprimeable number, because it can be changed into a prime (245421101) 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, 165311 + ... + 166788.

It is an arithmetic number, because the mean of its divisors is an integer number (61438500).

Almost surely, 2^245421161 is an apocalyptic number.

It is an amenable number.

245421161 is a deficient number, since it is larger than the sum of its proper divisors (332839).

245421161 is an equidigital number, since it uses as much as digits as its factorization.

245421161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332838.

The product of its digits is 1920, while the sum is 26.

The square root of 245421161 is about 15665.9235603906. The cubic root of 245421161 is about 626.0908191276.

The spelling of 245421161 in words is "two hundred forty-five million, four hundred twenty-one thousand, one hundred sixty-one".