161172733 has 4 divisors (see below), whose sum is σ = 170653500. Its totient is φ = 151691968.

The previous prime is 161172731. The next prime is 161172743. The reversal of 161172733 is 337271161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 136936804 + 24235929 = 11702^2 + 4923^2 .

It is a cyclic number.

It is not a de Polignac number, because 161172733 - 2¹ = 161172731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161172695 and 161172704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161172731) 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 3 ways as a sum of consecutive naturals, for example, 4740358 + ... + 4740391.

It is an arithmetic number, because the mean of its divisors is an integer number (42663375).

Almost surely, 2^161172733 is an apocalyptic number.

It is an amenable number.

161172733 is a deficient number, since it is larger than the sum of its proper divisors (9480767).

161172733 is an equidigital number, since it uses as much as digits as its factorization.

161172733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480766.

The product of its digits is 5292, while the sum is 31.

The square root of 161172733 is about 12695.3823495002. The cubic root of 161172733 is about 544.2066655036.

The spelling of 161172733 in words is "one hundred sixty-one million, one hundred seventy-two thousand, seven hundred thirty-three".