521143129 has 8 divisors (see below), whose sum is σ = 564949952. Its totient is φ = 477867600.

The previous prime is 521143127. The next prime is 521143159. The reversal of 521143129 is 921341125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521143129 - 2¹ = 521143127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521143097 and 521143106.

It is not an unprimeable number, because it can be changed into a prime (521143127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130779 + ... + 134704.

It is an arithmetic number, because the mean of its divisors is an integer number (70618744).

Almost surely, 2^521143129 is an apocalyptic number.

It is an amenable number.

521143129 is a deficient number, since it is larger than the sum of its proper divisors (43806823).

521143129 is a wasteful number, since it uses less digits than its factorization.

521143129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265647.

The product of its digits is 2160, while the sum is 28.

The square root of 521143129 is about 22828.5595033940. The cubic root of 521143129 is about 804.7339779148.

The spelling of 521143129 in words is "five hundred twenty-one million, one hundred forty-three thousand, one hundred twenty-nine".