161049040 has 20 divisors (see below), whose sum is σ = 374439204. Its totient is φ = 64419584.

The previous prime is 161049029. The next prime is 161049101. The reversal of 161049040 is 40940161.

It can be written as a sum of positive squares in 2 ways, for example, as 103713856 + 57335184 = 10184^2 + 7572^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 161048996 and 161049014.

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 3 ways as a sum of consecutive naturals, for example, 1006477 + ... + 1006636.

Almost surely, 2^161049040 is an apocalyptic number.

161049040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161049040 is an abundant number, since it is smaller than the sum of its proper divisors (213390164).

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

161049040 is a wasteful number, since it uses less digits than its factorization.

161049040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013126 (or 2013120 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 161049040 is about 12690.5098400340. The cubic root of 161049040 is about 544.0674116288.

The spelling of 161049040 in words is "one hundred sixty-one million, forty-nine thousand, forty".