866513 has 2 divisors, whose sum is σ = 866514. Its totient is φ = 866512.

The previous prime is 866477. The next prime is 866519. The reversal of 866513 is 315668.

866513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

866513 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861184 + 5329 = 928^2 + 73^2 .

It is a cyclic number.

It is not a de Polignac number, because 866513 - 2¹² = 862417 is a prime.

It is not a weakly prime, because it can be changed into another prime (866519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433256 + 433257.

It is an arithmetic number, because the mean of its divisors is an integer number (433257).

2⁸⁶⁶⁵¹³ is an apocalyptic number.

It is an amenable number.

866513 is a deficient number, since it is larger than the sum of its proper divisors (1).

866513 is an equidigital number, since it uses as much as digits as its factorization.

866513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 866513 is about 930.8668003533. The cubic root of 866513 is about 95.3363149126.

The spelling of 866513 in words is "eight hundred sixty-six thousand, five hundred thirteen".