161554925 has 12 divisors (see below), whose sum is σ = 228946656. Its totient is φ = 110780400.

The previous prime is 161554909. The next prime is 161554931. The reversal of 161554925 is 529455161.

It is not a de Polignac number, because 161554925 - 2⁴ = 161554909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 461411 + ... + 461760.

It is an arithmetic number, because the mean of its divisors is an integer number (19078888).

Almost surely, 2^161554925 is an apocalyptic number.

It is an amenable number.

161554925 is a deficient number, since it is larger than the sum of its proper divisors (67391731).

161554925 is an equidigital number, since it uses as much as digits as its factorization.

161554925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923188 (or 923183 counting only the distinct ones).

The product of its digits is 54000, while the sum is 38.

The square root of 161554925 is about 12710.4258386570. The cubic root of 161554925 is about 544.6364885090.

The spelling of 161554925 in words is "one hundred sixty-one million, five hundred fifty-four thousand, nine hundred twenty-five".