145321109 has 2 divisors, whose sum is σ = 145321110. Its totient is φ = 145321108.

The previous prime is 145321103. The next prime is 145321129. The reversal of 145321109 is 901123541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106296100 + 39025009 = 10310^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 145321109 - 2¹⁶ = 145255573 is a prime.

It is a super-2 number, since 2×145321109² = 42236449441979762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145321103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72660554 + 72660555.

It is an arithmetic number, because the mean of its divisors is an integer number (72660555).

Almost surely, 2^145321109 is an apocalyptic number.

It is an amenable number.

145321109 is a deficient number, since it is larger than the sum of its proper divisors (1).

145321109 is an equidigital number, since it uses as much as digits as its factorization.

145321109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 145321109 is about 12054.9205306381. The cubic root of 145321109 is about 525.7463115216.

The spelling of 145321109 in words is "one hundred forty-five million, three hundred twenty-one thousand, one hundred nine".