1641491 has 4 divisors (see below), whose sum is σ = 1661352. Its totient is φ = 1621632.

The previous prime is 1641473. The next prime is 1641509. The reversal of 1641491 is 1941461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1641473) and next prime (1641509).

It is a cyclic number.

It is not a de Polignac number, because 1641491 - 2¹⁰ = 1640467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641491.

It is not an unprimeable number, because it can be changed into a prime (1641091) 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, 9806 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (415338).

2^1641491 is an apocalyptic number.

1641491 is a deficient number, since it is larger than the sum of its proper divisors (19861).

1641491 is an equidigital number, since it uses as much as digits as its factorization.

1641491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19860.

The product of its digits is 864, while the sum is 26.

The square root of 1641491 is about 1281.2068529320. The cubic root of 1641491 is about 117.9630977205.

The spelling of 1641491 in words is "one million, six hundred forty-one thousand, four hundred ninety-one".