1206539 has 2 divisors, whose sum is σ = 1206540. Its totient is φ = 1206538.

The previous prime is 1206529. The next prime is 1206553. The reversal of 1206539 is 9356021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1206539 is a prime.

It is an Ulam number.

It is equal to p₉₃₃₈₃ and since 1206539 and 93383 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1206529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603269 + 603270.

It is an arithmetic number, because the mean of its divisors is an integer number (603270).

2^1206539 is an apocalyptic number.

1206539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206539 is an equidigital number, since it uses as much as digits as its factorization.

1206539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1206539 is about 1098.4256916150. The cubic root of 1206539 is about 106.4585274980.

The spelling of 1206539 in words is "one million, two hundred six thousand, five hundred thirty-nine".