1166639 has 2 divisors, whose sum is σ = 1166640. Its totient is φ = 1166638.

The previous prime is 1166617. The next prime is 1166663. The reversal of 1166639 is 9366611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1166639 - 2⁸ = 1166383 is a prime.

It is a super-2 number, since 2×1166639² = 2722093112642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583319 + 583320.

It is an arithmetic number, because the mean of its divisors is an integer number (583320).

2^1166639 is an apocalyptic number.

1166639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166639 is an equidigital number, since it uses as much as digits as its factorization.

1166639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 1166639 is about 1080.1106424807. The cubic root of 1166639 is about 105.2718277990.

The spelling of 1166639 in words is "one million, one hundred sixty-six thousand, six hundred thirty-nine".