528778381 has 2 divisors, whose sum is σ = 528778382. Its totient is φ = 528778380.

The previous prime is 528778333. The next prime is 528778391. The reversal of 528778381 is 183877825.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489515625 + 39262756 = 22125^2 + 6266^2 .

It is a cyclic number.

It is not a de Polignac number, because 528778381 - 2²³ = 520389773 is a prime.

It is a super-2 number, since 2×528778381² = 559213152425962322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (528778321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264389190 + 264389191.

It is an arithmetic number, because the mean of its divisors is an integer number (264389191).

Almost surely, 2^528778381 is an apocalyptic number.

It is an amenable number.

528778381 is a deficient number, since it is larger than the sum of its proper divisors (1).

528778381 is an equidigital number, since it uses as much as digits as its factorization.

528778381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 49.

The square root of 528778381 is about 22995.1816909543. The cubic root of 528778381 is about 808.6449839157.

The spelling of 528778381 in words is "five hundred twenty-eight million, seven hundred seventy-eight thousand, three hundred eighty-one".