1601993 has 6 divisors (see below), whose sum is σ = 1643742. Its totient is φ = 1561280.

The previous prime is 1601969. The next prime is 1602011. The reversal of 1601993 is 3991061.

It can be written as a sum of positive squares in 3 ways, for example, as 71824 + 1530169 = 268^2 + 1237^2 .

It is not a de Polignac number, because 1601993 - 2¹⁰ = 1600969 is a prime.

It is a super-3 number, since 3×1601993³ = 12333975941254480971, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1205 + ... + 2157.

It is an arithmetic number, because the mean of its divisors is an integer number (273957).

2^1601993 is an apocalyptic number.

It is an amenable number.

1601993 is a deficient number, since it is larger than the sum of its proper divisors (41749).

1601993 is an frugal number, since it uses more digits than its factorization.

1601993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1601993 is about 1265.6986213155. The cubic root of 1601993 is about 117.0092524399.

The spelling of 1601993 in words is "one million, six hundred one thousand, nine hundred ninety-three".