145220129 has 2 divisors, whose sum is σ = 145220130. Its totient is φ = 145220128.

The previous prime is 145220107. The next prime is 145220147. The reversal of 145220129 is 921022541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128777104 + 16443025 = 11348^2 + 4055^2 .

It is an emirp because it is prime and its reverse (921022541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145220129 - 2⁸ = 145219873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 145220098 and 145220107.

It is not a weakly prime, because it can be changed into another prime (145220329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72610064 + 72610065.

It is an arithmetic number, because the mean of its divisors is an integer number (72610065).

Almost surely, 2^145220129 is an apocalyptic number.

It is an amenable number.

145220129 is a deficient number, since it is larger than the sum of its proper divisors (1).

145220129 is an equidigital number, since it uses as much as digits as its factorization.

145220129 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 26.

The square root of 145220129 is about 12050.7314715747. The cubic root of 145220129 is about 525.6245073217.

The spelling of 145220129 in words is "one hundred forty-five million, two hundred twenty thousand, one hundred twenty-nine".