528349421 has 4 divisors (see below), whose sum is σ = 538318332. Its totient is φ = 518380512.

The previous prime is 528349417. The next prime is 528349427. The reversal of 528349421 is 124943825.

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 181980100 + 346369321 = 13490^2 + 18611^2 .

It is a cyclic number.

It is not a de Polignac number, because 528349421 - 2² = 528349417 is a prime.

It is a super-2 number, since 2×528349421² = 558306221342070482, which contains 22 as substring.

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 (528349427) 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, 4984376 + ... + 4984481.

It is an arithmetic number, because the mean of its divisors is an integer number (134579583).

Almost surely, 2^528349421 is an apocalyptic number.

It is an amenable number.

528349421 is a deficient number, since it is larger than the sum of its proper divisors (9968911).

528349421 is an equidigital number, since it uses as much as digits as its factorization.

528349421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968910.

The product of its digits is 69120, while the sum is 38.

The square root of 528349421 is about 22985.8526272140. The cubic root of 528349421 is about 808.4262595214.

The spelling of 528349421 in words is "five hundred twenty-eight million, three hundred forty-nine thousand, four hundred twenty-one".