161083821 has 8 divisors (see below), whose sum is σ = 215479264. Its totient is φ = 107038800.

The previous prime is 161083787. The next prime is 161083837. The reversal of 161083821 is 128380161.

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

It is not a de Polignac number, because 161083821 - 2⁷ = 161083693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161083841) 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, 86530 + ... + 88371.

It is an arithmetic number, because the mean of its divisors is an integer number (26934908).

Almost surely, 2^161083821 is an apocalyptic number.

It is an amenable number.

161083821 is a deficient number, since it is larger than the sum of its proper divisors (54395443).

161083821 is a wasteful number, since it uses less digits than its factorization.

161083821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175211.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 161083821 is about 12691.8801207701. The cubic root of 161083821 is about 544.1065753654.

The spelling of 161083821 in words is "one hundred sixty-one million, eighty-three thousand, eight hundred twenty-one".