1661067 has 10 divisors (see below), whose sum is σ = 2481468. Its totient is φ = 1107324.

The previous prime is 1661063. The next prime is 1661069. The reversal of 1661067 is 7601661.

It is not a de Polignac number, because 1661067 - 2² = 1661063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1661067.

It is not an unprimeable number, because it can be changed into a prime (1661063) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10173 + ... + 10334.

2^1661067 is an apocalyptic number.

1661067 is a deficient number, since it is larger than the sum of its proper divisors (820401).

1661067 is an equidigital number, since it uses as much as digits as its factorization.

1661067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20519 (or 20510 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1661067 is about 1288.8238824603. The cubic root of 1661067 is about 118.4301783845.

The spelling of 1661067 in words is "one million, six hundred sixty-one thousand, sixty-seven".