161406319 has 4 divisors (see below), whose sum is σ = 164840544. Its totient is φ = 157972096.

The previous prime is 161406317. The next prime is 161406331. The reversal of 161406319 is 913604161.

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 161406319 - 2¹ = 161406317 is a prime.

It is a super-2 number, since 2×161406319² = 52103999626259522, 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 (161406317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1717042 + ... + 1717135.

It is an arithmetic number, because the mean of its divisors is an integer number (41210136).

Almost surely, 2^161406319 is an apocalyptic number.

161406319 is a deficient number, since it is larger than the sum of its proper divisors (3434225).

161406319 is an equidigital number, since it uses as much as digits as its factorization.

161406319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434224.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 161406319 is about 12704.5786628286. The cubic root of 161406319 is about 544.4694429896.

The spelling of 161406319 in words is "one hundred sixty-one million, four hundred six thousand, three hundred nineteen".