161090 has 16 divisors (see below), whose sum is σ = 294840. Its totient is φ = 63360.

The previous prime is 161087. The next prime is 161093. The reversal of 161090 is 90161.

It is an interprime number because it is at equal distance from previous prime (161087) and next prime (161093).

It can be written as a sum of positive squares in 4 ways, for example, as 51529 + 109561 = 227^2 + 331^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (161093) 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, 800 + ... + 980.

2¹⁶¹⁰⁹⁰ is an apocalyptic number.

161090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161090 is a deficient number, since it is larger than the sum of its proper divisors (133750).

161090 is a wasteful number, since it uses less digits than its factorization.

161090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 161090 is about 401.3601873629. The cubic root of 161090 is about 54.4113532388.

The spelling of 161090 in words is "one hundred sixty-one thousand, ninety".