215345129 has 2 divisors, whose sum is σ = 215345130. Its totient is φ = 215345128.

The previous prime is 215345101. The next prime is 215345149. The reversal of 215345129 is 921543512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108264025 + 107081104 = 10405^2 + 10348^2 .

It is a cyclic number.

It is not a de Polignac number, because 215345129 - 2⁸ = 215344873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215345095 and 215345104.

It is not a weakly prime, because it can be changed into another prime (215345149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107672564 + 107672565.

It is an arithmetic number, because the mean of its divisors is an integer number (107672565).

Almost surely, 2^215345129 is an apocalyptic number.

It is an amenable number.

215345129 is a deficient number, since it is larger than the sum of its proper divisors (1).

215345129 is an equidigital number, since it uses as much as digits as its factorization.

215345129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 215345129 is about 14674.6423806511. The cubic root of 215345129 is about 599.3930241372.

The spelling of 215345129 in words is "two hundred fifteen million, three hundred forty-five thousand, one hundred twenty-nine".