161894031 has 8 divisors (see below), whose sum is σ = 232463280. Its totient is φ = 99627072.

The previous prime is 161894027. The next prime is 161894081. The reversal of 161894031 is 130498161.

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

It is not a de Polignac number, because 161894031 - 2² = 161894027 is a prime.

It is a super-2 number, since 2×161894031² = 52419354546857922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161893983 and 161894001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161894021) 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, 2075526 + ... + 2075603.

It is an arithmetic number, because the mean of its divisors is an integer number (29057910).

Almost surely, 2^161894031 is an apocalyptic number.

161894031 is a deficient number, since it is larger than the sum of its proper divisors (70569249).

161894031 is a wasteful number, since it uses less digits than its factorization.

161894031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151145.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161894031 is about 12723.7585249014. The cubic root of 161894031 is about 545.0172886809.

The spelling of 161894031 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, thirty-one".