528032261 has 4 divisors (see below), whose sum is σ = 546240300. Its totient is φ = 509824224.

The previous prime is 528032251. The next prime is 528032327. The reversal of 528032261 is 162230825.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 221116900 + 306915361 = 14870^2 + 17519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-528032261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 18208009 = 528032261 / (5 + 2 + 8 + 0 + 3 + 2 + 2 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528032221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9103976 + ... + 9104033.

It is an arithmetic number, because the mean of its divisors is an integer number (136560075).

Almost surely, 2^528032261 is an apocalyptic number.

528032261 is the 10277-th centered decagonal number.

It is an amenable number.

528032261 is a deficient number, since it is larger than the sum of its proper divisors (18208039).

528032261 is a wasteful number, since it uses less digits than its factorization.

528032261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18208038.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 528032261 is about 22978.9525653368. The cubic root of 528032261 is about 808.2644652089.

The spelling of 528032261 in words is "five hundred twenty-eight million, thirty-two thousand, two hundred sixty-one".