161098723 has 4 divisors (see below), whose sum is σ = 166295488. Its totient is φ = 155901960.

The previous prime is 161098699. The next prime is 161098727. The reversal of 161098723 is 327890161.

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 161098723 - 2⁹ = 161098211 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161098727) 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, 2598336 + ... + 2598397.

It is an arithmetic number, because the mean of its divisors is an integer number (41573872).

Almost surely, 2^161098723 is an apocalyptic number.

161098723 is a deficient number, since it is larger than the sum of its proper divisors (5196765).

161098723 is an equidigital number, since it uses as much as digits as its factorization.

161098723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196764.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 161098723 is about 12692.4671754549. The cubic root of 161098723 is about 544.1233534340.

The spelling of 161098723 in words is "one hundred sixty-one million, ninety-eight thousand, seven hundred twenty-three".