1641615893 has 4 divisors (see below), whose sum is σ = 1641840960. Its totient is φ = 1641390828.

The previous prime is 1641615887. The next prime is 1641615901. The reversal of 1641615893 is 3985161461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1641615893 - 2¹⁶ = 1641550357 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 (1641615803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101213 + ... + 116306.

It is an arithmetic number, because the mean of its divisors is an integer number (410460240).

Almost surely, 2^1641615893 is an apocalyptic number.

It is an amenable number.

1641615893 is a deficient number, since it is larger than the sum of its proper divisors (225067).

1641615893 is an equidigital number, since it uses as much as digits as its factorization.

1641615893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225066.

The product of its digits is 155520, while the sum is 44.

The square root of 1641615893 is about 40516.8593674288. The cubic root of 1641615893 is about 1179.6608938916.

The spelling of 1641615893 in words is "one billion, six hundred forty-one million, six hundred fifteen thousand, eight hundred ninety-three".