1662001 has 4 divisors (see below), whose sum is σ = 1813104. Its totient is φ = 1510900.

The previous prime is 1661983. The next prime is 1662007. The reversal of 1662001 is 1002661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1002661 = 11 ⋅91151.

It is a cyclic number.

It is not a de Polignac number, because 1662001 - 2⁵ = 1661969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662007) 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, 75535 + ... + 75556.

It is an arithmetic number, because the mean of its divisors is an integer number (453276).

2^1662001 is an apocalyptic number.

1662001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1662001 is a deficient number, since it is larger than the sum of its proper divisors (151103).

1662001 is a wasteful number, since it uses less digits than its factorization.

1662001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151102.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1662001 is about 1289.1861774003. The cubic root of 1662001 is about 118.4523715612.

Adding to 1662001 its reverse (1002661), we get a palindrome (2664662).

It can be divided in two parts, 16 and 62001, that multiplied together give a square (992016 = 996²).

The spelling of 1662001 in words is "one million, six hundred sixty-two thousand, one".