161312473 has 16 divisors (see below), whose sum is σ = 196318080. Its totient is φ = 129390336.

The previous prime is 161312401. The next prime is 161312509. The reversal of 161312473 is 374213161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161312473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161312273) 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 15 ways as a sum of consecutive naturals, for example, 17515 + ... + 25087.

It is an arithmetic number, because the mean of its divisors is an integer number (12269880).

Almost surely, 2^161312473 is an apocalyptic number.

It is an amenable number.

161312473 is a deficient number, since it is larger than the sum of its proper divisors (35005607).

161312473 is a wasteful number, since it uses less digits than its factorization.

161312473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7776.

The product of its digits is 3024, while the sum is 28.

The square root of 161312473 is about 12700.8847329625. The cubic root of 161312473 is about 544.3638994442.

The spelling of 161312473 in words is "one hundred sixty-one million, three hundred twelve thousand, four hundred seventy-three".