145845221 has 2 divisors, whose sum is σ = 145845222. Its totient is φ = 145845220.

The previous prime is 145845211. The next prime is 145845229. The reversal of 145845221 is 122548541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87628321 + 58216900 = 9361^2 + 7630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145845221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145845229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72922610 + 72922611.

It is an arithmetic number, because the mean of its divisors is an integer number (72922611).

Almost surely, 2^145845221 is an apocalyptic number.

It is an amenable number.

145845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

145845221 is an equidigital number, since it uses as much as digits as its factorization.

145845221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 32.

The square root of 145845221 is about 12076.6394746221. The cubic root of 145845221 is about 526.3776016594.

The spelling of 145845221 in words is "one hundred forty-five million, eight hundred forty-five thousand, two hundred twenty-one".