1965601 has 4 divisors (see below), whose sum is σ = 2144304. Its totient is φ = 1786900.

The previous prime is 1965577. The next prime is 1965619. The reversal of 1965601 is 1065691.

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.

It is a cyclic number.

It is not a de Polignac number, because 1965601 - 2¹⁹ = 1441313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1965601.

It is not an unprimeable number, because it can be changed into a prime (1965631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89335 + ... + 89356.

It is an arithmetic number, because the mean of its divisors is an integer number (536076).

2^1965601 is an apocalyptic number.

1965601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1965601 is a deficient number, since it is larger than the sum of its proper divisors (178703).

1965601 is a wasteful number, since it uses less digits than its factorization.

1965601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178702.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1965601 is about 1401.9989300994. The cubic root of 1965601 is about 125.2655899628.

The spelling of 1965601 in words is "one million, nine hundred sixty-five thousand, six hundred one".