245657161 has 4 divisors (see below), whose sum is σ = 246386452. Its totient is φ = 244927872.

The previous prime is 245657131. The next prime is 245657183. The reversal of 245657161 is 161756542.

It is a happy number.

245657161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 79762761 + 165894400 = 8931^2 + 12880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245657161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245657161.

It is not an unprimeable number, because it can be changed into a prime (245657101) 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, 364140 + ... + 364813.

It is an arithmetic number, because the mean of its divisors is an integer number (61596613).

Almost surely, 2^245657161 is an apocalyptic number.

It is an amenable number.

245657161 is a deficient number, since it is larger than the sum of its proper divisors (729291).

245657161 is an equidigital number, since it uses as much as digits as its factorization.

245657161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729290.

The product of its digits is 50400, while the sum is 37.

The square root of 245657161 is about 15673.4540226461. The cubic root of 245657161 is about 626.2914403728.

The spelling of 245657161 in words is "two hundred forty-five million, six hundred fifty-seven thousand, one hundred sixty-one".