245280161 has 4 divisors (see below), whose sum is σ = 280320192. Its totient is φ = 210240132.

The previous prime is 245280157. The next prime is 245280187. The reversal of 245280161 is 161082542.

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: 161082542 = 2 ⋅80541271.

It is a cyclic number.

It is not a de Polignac number, because 245280161 - 2² = 245280157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245280361) 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, 17520005 + ... + 17520018.

It is an arithmetic number, because the mean of its divisors is an integer number (70080048).

Almost surely, 2^245280161 is an apocalyptic number.

It is an amenable number.

245280161 is a deficient number, since it is larger than the sum of its proper divisors (35040031).

245280161 is an equidigital number, since it uses as much as digits as its factorization.

245280161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35040030.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 245280161 is about 15661.4227003807. The cubic root of 245280161 is about 625.9708950528.

The spelling of 245280161 in words is "two hundred forty-five million, two hundred eighty thousand, one hundred sixty-one".