1640169001 has 3 divisors (see below), whose sum is σ = 1640209501. Its totient is φ = 1640128502.

The previous prime is 1640168989. The next prime is 1640169029. The reversal of 1640169001 is 1009610461.

The square root of 1640169001 is 40499.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1009610461 = 23 ⋅43896107.

It is not a de Polignac number, because 1640169001 - 2²¹ = 1638071849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640169101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20250 + ... + 60748.

Almost surely, 2^1640169001 is an apocalyptic number.

1640169001 is the 40499-th square number.

1640169001 is the 20250-th centered octagonal number.

It is an amenable number.

1640169001 is a deficient number, since it is larger than the sum of its proper divisors (40500).

1640169001 is an frugal number, since it uses more digits than its factorization.

1640169001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80998 (or 40499 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The cubic root of 1640169001 is about 1179.3142144149.

Multiplying 1640169001 by its product of nonzero digits (1296), we get a square (2125659025296 = 1457964²).

Adding to 1640169001 its reverse (1009610461), we get a palindrome (2649779462).

The spelling of 1640169001 in words is "one billion, six hundred forty million, one hundred sixty-nine thousand, one".