161904611 has 8 divisors (see below), whose sum is σ = 176991744. Its totient is φ = 146878920.

The previous prime is 161904581. The next prime is 161904623. The reversal of 161904611 is 116409161.

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 161904611 - 2¹⁰ = 161903587 is a prime.

It is a super-2 number, since 2×161904611² = 52426206126122642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161904511) 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, 9755 + ... + 20468.

It is an arithmetic number, because the mean of its divisors is an integer number (22123968).

Almost surely, 2^161904611 is an apocalyptic number.

161904611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161904611 is a deficient number, since it is larger than the sum of its proper divisors (15087133).

161904611 is a wasteful number, since it uses less digits than its factorization.

161904611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30721.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 161904611 is about 12724.1742757634. The cubic root of 161904611 is about 545.0291609681.

The spelling of 161904611 in words is "one hundred sixty-one million, nine hundred four thousand, six hundred eleven".