161242090 has 16 divisors (see below), whose sum is σ = 290439720. Its totient is φ = 64451520.

The previous prime is 161242087. The next prime is 161242091. The reversal of 161242090 is 90242161.

161242090 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 73051209 + 88190881 = 8547^2 + 9391^2 .

It is not an unprimeable number, because it can be changed into a prime (161242091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11860 + ... + 21520.

Almost surely, 2^161242090 is an apocalyptic number.

161242090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161242090 is a deficient number, since it is larger than the sum of its proper divisors (129197630).

161242090 is a wasteful number, since it uses less digits than its factorization.

161242090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11337.

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

The square root of 161242090 is about 12698.1136394348. The cubic root of 161242090 is about 544.2847166068.

The spelling of 161242090 in words is "one hundred sixty-one million, two hundred forty-two thousand, ninety".