1603121423 has 2 divisors, whose sum is σ = 1603121424. Its totient is φ = 1603121422.

The previous prime is 1603121417. The next prime is 1603121453. The reversal of 1603121423 is 3241213061.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1603121423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1603121453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801560711 + 801560712.

It is an arithmetic number, because the mean of its divisors is an integer number (801560712).

Almost surely, 2^1603121423 is an apocalyptic number.

1603121423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603121423 is an equidigital number, since it uses as much as digits as its factorization.

1603121423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1603121423 is about 40038.9987761932. The cubic root of 1603121423 is about 1170.3671925624.

Adding to 1603121423 its reverse (3241213061), we get a palindrome (4844334484).

The spelling of 1603121423 in words is "one billion, six hundred three million, one hundred twenty-one thousand, four hundred twenty-three".