855930521 has 2 divisors, whose sum is σ = 855930522. Its totient is φ = 855930520.

The previous prime is 855930511. The next prime is 855930529. The reversal of 855930521 is 125039558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439321600 + 416608921 = 20960^2 + 20411^2 .

It is a cyclic number.

It is not a de Polignac number, because 855930521 - 2¹⁸ = 855668377 is a prime.

It is not a weakly prime, because it can be changed into another prime (855930529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427965260 + 427965261.

It is an arithmetic number, because the mean of its divisors is an integer number (427965261).

Almost surely, 2^855930521 is an apocalyptic number.

It is an amenable number.

855930521 is a deficient number, since it is larger than the sum of its proper divisors (1).

855930521 is an equidigital number, since it uses as much as digits as its factorization.

855930521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 855930521 is about 29256.2902808951. The cubic root of 855930521 is about 949.4661898561.

The spelling of 855930521 in words is "eight hundred fifty-five million, nine hundred thirty thousand, five hundred twenty-one".