1641089801 has 4 divisors (see below), whose sum is σ = 1767327492. Its totient is φ = 1514852112.

The previous prime is 1641089761. The next prime is 1641089839. The reversal of 1641089801 is 1089801461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78943225 + 1562146576 = 8885^2 + 39524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641089801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641089201) 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, 63118826 + ... + 63118851.

It is an arithmetic number, because the mean of its divisors is an integer number (441831873).

Almost surely, 2^1641089801 is an apocalyptic number.

It is an amenable number.

1641089801 is a deficient number, since it is larger than the sum of its proper divisors (126237691).

1641089801 is a wasteful number, since it uses less digits than its factorization.

1641089801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126237690.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1641089801 is about 40510.3665868380. The cubic root of 1641089801 is about 1179.5348643152.

The spelling of 1641089801 in words is "one billion, six hundred forty-one million, eighty-nine thousand, eight hundred one".