145512209 has 2 divisors, whose sum is σ = 145512210. Its totient is φ = 145512208.

The previous prime is 145512173. The next prime is 145512223. The reversal of 145512209 is 902215541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135652609 + 9859600 = 11647^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 145512209 - 2¹² = 145508113 is a prime.

It is not a weakly prime, because it can be changed into another prime (145511209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72756104 + 72756105.

It is an arithmetic number, because the mean of its divisors is an integer number (72756105).

Almost surely, 2^145512209 is an apocalyptic number.

It is an amenable number.

145512209 is a deficient number, since it is larger than the sum of its proper divisors (1).

145512209 is an equidigital number, since it uses as much as digits as its factorization.

145512209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 145512209 is about 12062.8441505310. The cubic root of 145512209 is about 525.9766660171.

The spelling of 145512209 in words is "one hundred forty-five million, five hundred twelve thousand, two hundred nine".