161743399 has 8 divisors (see below), whose sum is σ = 169250432. Its totient is φ = 154379520.

The previous prime is 161743381. The next prime is 161743459. The reversal of 161743399 is 993347161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161743399 - 2⁷ = 161743271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161743999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33474 + ... + 37999.

It is an arithmetic number, because the mean of its divisors is an integer number (21156304).

Almost surely, 2^161743399 is an apocalyptic number.

161743399 is a deficient number, since it is larger than the sum of its proper divisors (7507033).

161743399 is an equidigital number, since it uses as much as digits as its factorization.

161743399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71577.

The product of its digits is 122472, while the sum is 43.

The square root of 161743399 is about 12717.8378272409. The cubic root of 161743399 is about 544.8482016987.

The spelling of 161743399 in words is "one hundred sixty-one million, seven hundred forty-three thousand, three hundred ninety-nine".