1641187 has 4 divisors (see below), whose sum is σ = 1644160. Its totient is φ = 1638216.

The previous prime is 1641161. The next prime is 1641217. The reversal of 1641187 is 7811461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7811461 = 7 ⋅1115923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387 + ... + 1852.

It is an arithmetic number, because the mean of its divisors is an integer number (411040).

2^1641187 is an apocalyptic number.

1641187 is a deficient number, since it is larger than the sum of its proper divisors (2973).

1641187 is an equidigital number, since it uses as much as digits as its factorization.

1641187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972.

The product of its digits is 1344, while the sum is 28.

The square root of 1641187 is about 1281.0882092971. The cubic root of 1641187 is about 117.9558151147.

The spelling of 1641187 in words is "one million, six hundred forty-one thousand, one hundred eighty-seven".