1661149 has 16 divisors (see below), whose sum is σ = 2016000. Its totient is φ = 1366512.

The previous prime is 1661141. The next prime is 1661159. The reversal of 1661149 is 9411661.

It is not a de Polignac number, because 1661149 - 2³ = 1661141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9864 + ... + 10030.

It is an arithmetic number, because the mean of its divisors is an integer number (126000).

2^1661149 is an apocalyptic number.

It is an amenable number.

1661149 is a deficient number, since it is larger than the sum of its proper divisors (354851).

1661149 is an equidigital number, since it uses as much as digits as its factorization.

1661149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 203 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 1661149 is about 1288.8556940170. The cubic root of 1661149 is about 118.4321271549.

The spelling of 1661149 in words is "one million, six hundred sixty-one thousand, one hundred forty-nine".