161251211 has 8 divisors (see below), whose sum is σ = 176004144. Its totient is φ = 146513920.

The previous prime is 161251169. The next prime is 161251241. The reversal of 161251211 is 112152161.

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

It is a cyclic number.

It is not a de Polignac number, because 161251211 - 2⁶ = 161251147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161251241) 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 7 ways as a sum of consecutive naturals, for example, 32171 + ... + 36843.

It is an arithmetic number, because the mean of its divisors is an integer number (22000518).

Almost surely, 2^161251211 is an apocalyptic number.

161251211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161251211 is a deficient number, since it is larger than the sum of its proper divisors (14752933).

161251211 is a wasteful number, since it uses less digits than its factorization.

161251211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821.

The product of its digits is 120, while the sum is 20.

The square root of 161251211 is about 12698.4727821892. The cubic root of 161251211 is about 544.2949792855.

The spelling of 161251211 in words is "one hundred sixty-one million, two hundred fifty-one thousand, two hundred eleven".