161682447 has 4 divisors (see below), whose sum is σ = 215576600. Its totient is φ = 107788296.

The previous prime is 161682421. The next prime is 161682449. The reversal of 161682447 is 744286161.

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

It is not a de Polignac number, because 161682447 - 2⁷ = 161682319 is a prime.

It is a super-2 number, since 2×161682447² = 52282427335815618, 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 (161682449) 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, 26947072 + ... + 26947077.

It is an arithmetic number, because the mean of its divisors is an integer number (53894150).

Almost surely, 2^161682447 is an apocalyptic number.

161682447 is a deficient number, since it is larger than the sum of its proper divisors (53894153).

161682447 is an equidigital number, since it uses as much as digits as its factorization.

161682447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53894152.

The product of its digits is 64512, while the sum is 39.

The square root of 161682447 is about 12715.4412821577. The cubic root of 161682447 is about 544.7797522075.

The spelling of 161682447 in words is "one hundred sixty-one million, six hundred eighty-two thousand, four hundred forty-seven".