1641486191 has 4 divisors (see below), whose sum is σ = 1641706992. Its totient is φ = 1641265392.

The previous prime is 1641486179. The next prime is 1641486193. The reversal of 1641486191 is 1916841461.

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

It is a cyclic number.

It is not a de Polignac number, because 1641486191 - 2¹⁴ = 1641469807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641486193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98846 + ... + 114251.

It is an arithmetic number, because the mean of its divisors is an integer number (410426748).

Almost surely, 2^1641486191 is an apocalyptic number.

1641486191 is a deficient number, since it is larger than the sum of its proper divisors (220801).

1641486191 is an equidigital number, since it uses as much as digits as its factorization.

1641486191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220800.

The product of its digits is 41472, while the sum is 41.

The square root of 1641486191 is about 40515.2587428490. The cubic root of 1641486191 is about 1179.6298252338.

The spelling of 1641486191 in words is "one billion, six hundred forty-one million, four hundred eighty-six thousand, one hundred ninety-one".