161420636 has 12 divisors (see below), whose sum is σ = 304215912. Its totient is φ = 74501808.

The previous prime is 161420617. The next prime is 161420639. The reversal of 161420636 is 636024161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161420599 and 161420608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161420639) 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, 1552070 + ... + 1552173.

It is an arithmetic number, because the mean of its divisors is an integer number (25351326).

Almost surely, 2^161420636 is an apocalyptic number.

It is an amenable number.

161420636 is a deficient number, since it is larger than the sum of its proper divisors (142795276).

161420636 is a wasteful number, since it uses less digits than its factorization.

161420636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104260 (or 3104258 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 161420636 is about 12705.1421086110. The cubic root of 161420636 is about 544.4855409520.

Adding to 161420636 its reverse (636024161), we get a palindrome (797444797).

The spelling of 161420636 in words is "one hundred sixty-one million, four hundred twenty thousand, six hundred thirty-six".