869521 has 2 divisors, whose sum is σ = 869522. Its totient is φ = 869520.

The previous prime is 869501. The next prime is 869543. The reversal of 869521 is 125968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 261121 = 780^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 869521 - 2⁵ = 869489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434760 + 434761.

It is an arithmetic number, because the mean of its divisors is an integer number (434761).

2⁸⁶⁹⁵²¹ is an apocalyptic number.

It is an amenable number.

869521 is a deficient number, since it is larger than the sum of its proper divisors (1).

869521 is an equidigital number, since it uses as much as digits as its factorization.

869521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 869521 is about 932.4810990042. The cubic root of 869521 is about 95.4465038508.

The spelling of 869521 in words is "eight hundred sixty-nine thousand, five hundred twenty-one".