1601601623 has 2 divisors, whose sum is σ = 1601601624. Its totient is φ = 1601601622.

The previous prime is 1601601613. The next prime is 1601601667. The reversal of 1601601623 is 3261061061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1601601623 - 2⁶ = 1601601559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1601601592 and 1601601601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601601613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800800811 + 800800812.

It is an arithmetic number, because the mean of its divisors is an integer number (800800812).

Almost surely, 2^1601601623 is an apocalyptic number.

1601601623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601601623 is an equidigital number, since it uses as much as digits as its factorization.

1601601623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1601601623 is about 40020.0152798572. The cubic root of 1601601623 is about 1169.9972296426.

Adding to 1601601623 its reverse (3261061061), we get a palindrome (4862662684).

The spelling of 1601601623 in words is "one billion, six hundred one million, six hundred one thousand, six hundred twenty-three".