6215428129 has 4 divisors (see below), whose sum is σ = 6215585860. Its totient is φ = 6215270400.

The previous prime is 6215428127. The next prime is 6215428151. The reversal of 6215428129 is 9218245126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5379929104 + 835499025 = 73348^2 + 28905^2 .

It is a cyclic number.

It is not a de Polignac number, because 6215428129 - 2¹ = 6215428127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6215428091 and 6215428100.

It is not an unprimeable number, because it can be changed into a prime (6215428127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36337 + ... + 117265.

It is an arithmetic number, because the mean of its divisors is an integer number (1553896465).

Almost surely, 2^6215428129 is an apocalyptic number.

It is an amenable number.

6215428129 is a deficient number, since it is larger than the sum of its proper divisors (157731).

6215428129 is an equidigital number, since it uses as much as digits as its factorization.

6215428129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157730.

The product of its digits is 69120, while the sum is 40.

The square root of 6215428129 is about 78837.9865864166. The cubic root of 6215428129 is about 1838.6130980194.

The spelling of 6215428129 in words is "six billion, two hundred fifteen million, four hundred twenty-eight thousand, one hundred twenty-nine".