161723049 has 4 divisors (see below), whose sum is σ = 215630736. Its totient is φ = 107815364.

The previous prime is 161723047. The next prime is 161723077. The reversal of 161723049 is 940327161.

161723049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 940327161 = 3 ⋅313442387.

It is a cyclic number.

It is not a de Polignac number, because 161723049 - 2¹ = 161723047 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161723047) 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, 26953839 + ... + 26953844.

It is an arithmetic number, because the mean of its divisors is an integer number (53907684).

Almost surely, 2^161723049 is an apocalyptic number.

It is an amenable number.

161723049 is a deficient number, since it is larger than the sum of its proper divisors (53907687).

161723049 is an equidigital number, since it uses as much as digits as its factorization.

161723049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53907686.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 161723049 is about 12717.0377446951. The cubic root of 161723049 is about 544.8253504293.

The spelling of 161723049 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, forty-nine".