161185490 has 8 divisors (see below), whose sum is σ = 290133900. Its totient is φ = 64474192.

The previous prime is 161185489. The next prime is 161185499. The reversal of 161185490 is 94581161.

It can be written as a sum of positive squares in 2 ways, for example, as 150577441 + 10608049 = 12271^2 + 3257^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 161185490.

It is not an unprimeable number, because it can be changed into a prime (161185499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8059265 + ... + 8059284.

Almost surely, 2^161185490 is an apocalyptic number.

161185490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161185490 is a deficient number, since it is larger than the sum of its proper divisors (128948410).

161185490 is a wasteful number, since it uses less digits than its factorization.

161185490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16118556.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 161185490 is about 12695.8847663328. The cubic root of 161185490 is about 544.2210233112.

The spelling of 161185490 in words is "one hundred sixty-one million, one hundred eighty-five thousand, four hundred ninety".