161820494 has 8 divisors (see below), whose sum is σ = 264797208. Its totient is φ = 73554760.

The previous prime is 161820457. The next prime is 161820517. The reversal of 161820494 is 494028161.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3677717 + ... + 3677760.

It is an arithmetic number, because the mean of its divisors is an integer number (33099651).

Almost surely, 2^161820494 is an apocalyptic number.

161820494 is a deficient number, since it is larger than the sum of its proper divisors (102976714).

161820494 is a wasteful number, since it uses less digits than its factorization.

161820494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7355490.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 161820494 is about 12720.8684451967. The cubic root of 161820494 is about 544.9347552566.

The spelling of 161820494 in words is "one hundred sixty-one million, eight hundred twenty thousand, four hundred ninety-four".