887765521 has 2 divisors, whose sum is σ = 887765522. Its totient is φ = 887765520.

The previous prime is 887765509. The next prime is 887765533. The reversal of 887765521 is 125567788.

It is a balanced prime because it is at equal distance from previous prime (887765509) and next prime (887765533).

It can be written as a sum of positive squares in only one way, i.e., 807412225 + 80353296 = 28415^2 + 8964^2 .

It is a cyclic number.

It is not a de Polignac number, because 887765521 - 2⁹ = 887765009 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (887765621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443882760 + 443882761.

It is an arithmetic number, because the mean of its divisors is an integer number (443882761).

Almost surely, 2^887765521 is an apocalyptic number.

It is an amenable number.

887765521 is a deficient number, since it is larger than the sum of its proper divisors (1).

887765521 is an equidigital number, since it uses as much as digits as its factorization.

887765521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 49.

The square root of 887765521 is about 29795.3942917358. The cubic root of 887765521 is about 961.0944985745.

The spelling of 887765521 in words is "eight hundred eighty-seven million, seven hundred sixty-five thousand, five hundred twenty-one".