1601223635 has 32 divisors (see below), whose sum is σ = 2153088000. Its totient is φ = 1133049600.

The previous prime is 1601223607. The next prime is 1601223641. The reversal of 1601223635 is 5363221061.

It is not a de Polignac number, because 1601223635 - 2¹⁶ = 1601158099 is a prime.

It is a super-2 number, since 2×1601223635² = 5127834258565226450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1601223598 and 1601223607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1124534 + ... + 1125956.

It is an arithmetic number, because the mean of its divisors is an integer number (67284000).

Almost surely, 2^1601223635 is an apocalyptic number.

1601223635 is a deficient number, since it is larger than the sum of its proper divisors (551864365).

1601223635 is a wasteful number, since it uses less digits than its factorization.

1601223635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1601223635 is about 40015.2925142376. The cubic root of 1601223635 is about 1169.9051801795.

Adding to 1601223635 its reverse (5363221061), we get a palindrome (6964444696).

The spelling of 1601223635 in words is "one billion, six hundred one million, two hundred twenty-three thousand, six hundred thirty-five".