161610919 has 4 divisors (see below), whose sum is σ = 161703144. Its totient is φ = 161518696.

The previous prime is 161610893. The next prime is 161610923. The reversal of 161610919 is 919016161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161610919 - 2⁵ = 161610887 is a prime.

It is a super-2 number, since 2×161610919² = 52236178280049122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161617919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43432 + ... + 47005.

It is an arithmetic number, because the mean of its divisors is an integer number (40425786).

Almost surely, 2^161610919 is an apocalyptic number.

161610919 is a deficient number, since it is larger than the sum of its proper divisors (92225).

161610919 is an equidigital number, since it uses as much as digits as its factorization.

161610919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92224.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 161610919 is about 12712.6283277692. The cubic root of 161610919 is about 544.6994038569.

The spelling of 161610919 in words is "one hundred sixty-one million, six hundred ten thousand, nine hundred nineteen".