1601971 has 4 divisors (see below), whose sum is σ = 1830832. Its totient is φ = 1373112.

The previous prime is 1601969. The next prime is 1602011. The reversal of 1601971 is 1791061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1791061 = 449 ⋅3989.

It is a cyclic number.

It is not a de Polignac number, because 1601971 - 2¹ = 1601969 is a prime.

It is a super-3 number, since 3×1601971³ = 12333467804681464833, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114420 + ... + 114433.

It is an arithmetic number, because the mean of its divisors is an integer number (457708).

2^1601971 is an apocalyptic number.

1601971 is a deficient number, since it is larger than the sum of its proper divisors (228861).

1601971 is an equidigital number, since it uses as much as digits as its factorization.

1601971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228860.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1601971 is about 1265.6899304332. The cubic root of 1601971 is about 117.0087168123.

The spelling of 1601971 in words is "one million, six hundred one thousand, nine hundred seventy-one".