527791721 has 2 divisors, whose sum is σ = 527791722. Its totient is φ = 527791720.

The previous prime is 527791657. The next prime is 527791751. The reversal of 527791721 is 127197725.

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., 351937600 + 175854121 = 18760^2 + 13261^2 .

It is a cyclic number.

It is not a de Polignac number, because 527791721 - 2⁶ = 527791657 is a prime.

It is a super-2 number, since 2×527791721² = 557128201512283682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (527791751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263895860 + 263895861.

It is an arithmetic number, because the mean of its divisors is an integer number (263895861).

Almost surely, 2^527791721 is an apocalyptic number.

It is an amenable number.

527791721 is a deficient number, since it is larger than the sum of its proper divisors (1).

527791721 is an equidigital number, since it uses as much as digits as its factorization.

527791721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61740, while the sum is 41.

The square root of 527791721 is about 22973.7180491099. The cubic root of 527791721 is about 808.1417142091.

The spelling of 527791721 in words is "five hundred twenty-seven million, seven hundred ninety-one thousand, seven hundred twenty-one".