161654831 has 16 divisors (see below), whose sum is σ = 184396800. Its totient is φ = 140483808.

The previous prime is 161654789. The next prime is 161654861. The reversal of 161654831 is 138456161.

It is a cyclic number.

It is not a de Polignac number, because 161654831 - 2⁶ = 161654767 is a prime.

It is a super-2 number, since 2×161654831² = 52264568771277122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161654791 and 161654800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161654861) 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 15 ways as a sum of consecutive naturals, for example, 39290 + ... + 43208.

It is an arithmetic number, because the mean of its divisors is an integer number (11524800).

Almost surely, 2^161654831 is an apocalyptic number.

161654831 is a deficient number, since it is larger than the sum of its proper divisors (22741969).

161654831 is a wasteful number, since it uses less digits than its factorization.

161654831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118.

The product of its digits is 17280, while the sum is 35.

The square root of 161654831 is about 12714.3553120085. The cubic root of 161654831 is about 544.7487335976.

The spelling of 161654831 in words is "one hundred sixty-one million, six hundred fifty-four thousand, eight hundred thirty-one".