161225624 has 32 divisors (see below), whose sum is σ = 345907200. Its totient is φ = 69012000.

The previous prime is 161225579. The next prime is 161225627. The reversal of 161225624 is 426522161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161225627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70499 + ... + 72749.

It is an arithmetic number, because the mean of its divisors is an integer number (10809600).

Almost surely, 2^161225624 is an apocalyptic number.

161225624 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161225624 is an abundant number, since it is smaller than the sum of its proper divisors (184681576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161225624 is a wasteful number, since it uses less digits than its factorization.

161225624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543 (or 3539 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 161225624 is about 12697.4652588617. The cubic root of 161225624 is about 544.2661885718.

Adding to 161225624 its reverse (426522161), we get a palindrome (587747785).

The spelling of 161225624 in words is "one hundred sixty-one million, two hundred twenty-five thousand, six hundred twenty-four".