145222009 has 2 divisors, whose sum is σ = 145222010. Its totient is φ = 145222008.

The previous prime is 145222001. The next prime is 145222013. The reversal of 145222009 is 900222541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125888400 + 19333609 = 11220^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 145222009 - 2³ = 145222001 is a prime.

It is not a weakly prime, because it can be changed into another prime (145222001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72611004 + 72611005.

It is an arithmetic number, because the mean of its divisors is an integer number (72611005).

Almost surely, 2^145222009 is an apocalyptic number.

It is an amenable number.

145222009 is a deficient number, since it is larger than the sum of its proper divisors (1).

145222009 is an equidigital number, since it uses as much as digits as its factorization.

145222009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 145222009 is about 12050.8094748859. The cubic root of 145222009 is about 525.6267755330.

The spelling of 145222009 in words is "one hundred forty-five million, two hundred twenty-two thousand, nine".