161624 has 16 divisors (see below), whose sum is σ = 307800. Its totient is φ = 79552.

The previous prime is 161611. The next prime is 161627. The reversal of 161624 is 426161.

161624 = T₁₉₇ + T₁₉₈ + ... + T₂₀₄.

It is a happy number.

It is a super-2 number, since 2×161624² = 52244634752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161596 and 161605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161627) 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, 599 + ... + 825.

2¹⁶¹⁶²⁴ is an apocalyptic number.

It is an amenable number.

161624 is a deficient number, since it is larger than the sum of its proper divisors (146176).

161624 is a wasteful number, since it uses less digits than its factorization.

161624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 318 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 161624 is about 402.0248748523. The cubic root of 161624 is about 54.4714099689.

Subtracting from 161624 its sum of digits (20), we obtain a square (161604 = 402²).

Adding to 161624 its reverse (426161), we get a palindrome (587785).

The spelling of 161624 in words is "one hundred sixty-one thousand, six hundred twenty-four".