145121201 has 2 divisors, whose sum is σ = 145121202. Its totient is φ = 145121200.

The previous prime is 145121189. The next prime is 145121203. The reversal of 145121201 is 102121541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117831025 + 27290176 = 10855^2 + 5224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145121201 is a prime.

Together with 145121203, 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 145121201.

It is not a weakly prime, because it can be changed into another prime (145121203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72560600 + 72560601.

It is an arithmetic number, because the mean of its divisors is an integer number (72560601).

Almost surely, 2^145121201 is an apocalyptic number.

It is an amenable number.

145121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

145121201 is an equidigital number, since it uses as much as digits as its factorization.

145121201 is an odious number, because the sum of its binary digits is odd.

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

The square root of 145121201 is about 12046.6261251854. The cubic root of 145121201 is about 525.5051235196.

Adding to 145121201 its reverse (102121541), we get a palindrome (247242742).

It can be divided in two parts, 14 and 5121201, that added together give a palindrome (5121215).

The spelling of 145121201 in words is "one hundred forty-five million, one hundred twenty-one thousand, two hundred one".