1601903 has 4 divisors (see below), whose sum is σ = 1625880. Its totient is φ = 1577928.

The previous prime is 1601869. The next prime is 1601953. The reversal of 1601903 is 3091061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3091061 = 733 ⋅4217.

It is a cyclic number.

It is not a de Polignac number, because 1601903 - 2⁸ = 1601647 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 11888 + ... + 12021.

It is an arithmetic number, because the mean of its divisors is an integer number (406470).

2^1601903 is an apocalyptic number.

1601903 is a deficient number, since it is larger than the sum of its proper divisors (23977).

1601903 is an equidigital number, since it uses as much as digits as its factorization.

1601903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23976.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1601903 is about 1265.6630673287. The cubic root of 1601903 is about 117.0070612048.

Adding to 1601903 its reverse (3091061), we get a palindrome (4692964).

The spelling of 1601903 in words is "one million, six hundred one thousand, nine hundred three".