1611667 has 2 divisors, whose sum is σ = 1611668. Its totient is φ = 1611666.

The previous prime is 1611613. The next prime is 1611689. The reversal of 1611667 is 7661161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1611667 - 2⁷ = 1611539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805833 + 805834.

It is an arithmetic number, because the mean of its divisors is an integer number (805834).

2^1611667 is an apocalyptic number.

1611667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611667 is an equidigital number, since it uses as much as digits as its factorization.

1611667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 1611667 is about 1269.5144741199. The cubic root of 1611667 is about 117.2443089422.

It can be divided in two parts, 1611 and 667, that added together give a triangular number (2278 = T₆₇).

The spelling of 1611667 in words is "one million, six hundred eleven thousand, six hundred sixty-seven".