245155121 has 4 divisors (see below), whose sum is σ = 245487600. Its totient is φ = 244822644.

The previous prime is 245155111. The next prime is 245155123. The reversal of 245155121 is 121551542.

245155121 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245155121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245155123) 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, 165131 + ... + 166608.

It is an arithmetic number, because the mean of its divisors is an integer number (61371900).

Almost surely, 2^245155121 is an apocalyptic number.

It is an amenable number.

245155121 is a deficient number, since it is larger than the sum of its proper divisors (332479).

245155121 is an equidigital number, since it uses as much as digits as its factorization.

245155121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332478.

The product of its digits is 2000, while the sum is 26.

The square root of 245155121 is about 15657.4302169928. The cubic root of 245155121 is about 625.8645069065.

The spelling of 245155121 in words is "two hundred forty-five million, one hundred fifty-five thousand, one hundred twenty-one".