161273734 has 4 divisors (see below), whose sum is σ = 241910604. Its totient is φ = 80636866.

The previous prime is 161273719. The next prime is 161273741. The reversal of 161273734 is 437372161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 437372161 = 193 ⋅2266177.

It is a self number, because there is not a number n which added to its sum of digits gives 161273734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40318432 + ... + 40318435.

It is an arithmetic number, because the mean of its divisors is an integer number (60477651).

Almost surely, 2^161273734 is an apocalyptic number.

161273734 is a deficient number, since it is larger than the sum of its proper divisors (80636870).

161273734 is an equidigital number, since it uses as much as digits as its factorization.

161273734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80636869.

The product of its digits is 21168, while the sum is 34.

The square root of 161273734 is about 12699.3595901526. The cubic root of 161273734 is about 544.3203198395.

The spelling of 161273734 in words is "one hundred sixty-one million, two hundred seventy-three thousand, seven hundred thirty-four".