161389090 has 8 divisors (see below), whose sum is σ = 290500380. Its totient is φ = 64555632.

The previous prime is 161389051. The next prime is 161389121. The reversal of 161389090 is 90983161.

It can be written as a sum of positive squares in 2 ways, for example, as 158080329 + 3308761 = 12573^2 + 1819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 8069445 + ... + 8069464.

Almost surely, 2^161389090 is an apocalyptic number.

161389090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161389090 is a deficient number, since it is larger than the sum of its proper divisors (129111290).

161389090 is a wasteful number, since it uses less digits than its factorization.

161389090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16138916.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 161389090 is about 12703.9005821047. The cubic root of 161389090 is about 544.4500695271.

The spelling of 161389090 in words is "one hundred sixty-one million, three hundred eighty-nine thousand, ninety".