1603121441 has 4 divisors (see below), whose sum is σ = 1603430400. Its totient is φ = 1602812484.

The previous prime is 1603121423. The next prime is 1603121453. The reversal of 1603121441 is 1441213061.

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 a de Polignac number, because none of the positive numbers 2^k-1603121441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1603123441) 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, 146561 + ... + 157118.

It is an arithmetic number, because the mean of its divisors is an integer number (400857600).

Almost surely, 2^1603121441 is an apocalyptic number.

It is an amenable number.

1603121441 is a deficient number, since it is larger than the sum of its proper divisors (308959).

1603121441 is an equidigital number, since it uses as much as digits as its factorization.

1603121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308958.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1603121441 is about 40038.9990009740. Note that the first 3 decimals coincide. The cubic root of 1603121441 is about 1170.3671969427.

The spelling of 1603121441 in words is "one billion, six hundred three million, one hundred twenty-one thousand, four hundred forty-one".