145822209 has 16 divisors (see below), whose sum is σ = 221703552. Its totient is φ = 84457728.

The previous prime is 145822189. The next prime is 145822213. The reversal of 145822209 is 902228541.

It is not a de Polignac number, because 145822209 - 2⁵ = 145822177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145822209.

It is not an unprimeable number, because it can be changed into a prime (145822249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109309 + ... + 110634.

It is an arithmetic number, because the mean of its divisors is an integer number (13856472).

Almost surely, 2^145822209 is an apocalyptic number.

It is an amenable number.

145822209 is a deficient number, since it is larger than the sum of its proper divisors (75881343).

145822209 is a wasteful number, since it uses less digits than its factorization.

145822209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219976.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 145822209 is about 12075.6866885490. The cubic root of 145822209 is about 526.3499155997.

The spelling of 145822209 in words is "one hundred forty-five million, eight hundred twenty-two thousand, two hundred nine".