245121101 has 2 divisors, whose sum is σ = 245121102. Its totient is φ = 245121100.

The previous prime is 245121089. The next prime is 245121103. The reversal of 245121101 is 101121542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130074025 + 115047076 = 11405^2 + 10726^2 .

It is a cyclic number.

It is not a de Polignac number, because 245121101 - 2¹⁰ = 245120077 is a prime.

Together with 245121103, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245121101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245121103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122560550 + 122560551.

It is an arithmetic number, because the mean of its divisors is an integer number (122560551).

Almost surely, 2^245121101 is an apocalyptic number.

It is an amenable number.

245121101 is a deficient number, since it is larger than the sum of its proper divisors (1).

245121101 is an equidigital number, since it uses as much as digits as its factorization.

245121101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 245121101 is about 15656.3437941302. The cubic root of 245121101 is about 625.8355553113.

Adding to 245121101 its reverse (101121542), we get a palindrome (346242643).

The spelling of 245121101 in words is "two hundred forty-five million, one hundred twenty-one thousand, one hundred one".