1601623 has 2 divisors, whose sum is σ = 1601624. Its totient is φ = 1601622.

The previous prime is 1601617. The next prime is 1601627. The reversal of 1601623 is 3261061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1601623 - 2⁵ = 1601591 is a prime.

1601623 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800811 + 800812.

It is an arithmetic number, because the mean of its divisors is an integer number (800812).

2^1601623 is an apocalyptic number.

1601623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601623 is an equidigital number, since it uses as much as digits as its factorization.

1601623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1601623 is about 1265.5524485378. The cubic root of 1601623 is about 117.0002435040. Note that the first 3 decimals are identical.

Adding to 1601623 its reverse (3261061), we get a palindrome (4862684).

The spelling of 1601623 in words is "one million, six hundred one thousand, six hundred twenty-three".