161418733 has 4 divisors (see below), whose sum is σ = 184478560. Its totient is φ = 138358908.

The previous prime is 161418731. The next prime is 161418769. The reversal of 161418733 is 337814161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 337814161 = 31 ⋅10897231.

It is a cyclic number.

It is not a de Polignac number, because 161418733 - 2¹ = 161418731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161418731) 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, 11529903 + ... + 11529916.

It is an arithmetic number, because the mean of its divisors is an integer number (46119640).

Almost surely, 2^161418733 is an apocalyptic number.

It is an amenable number.

161418733 is a deficient number, since it is larger than the sum of its proper divisors (23059827).

161418733 is an equidigital number, since it uses as much as digits as its factorization.

161418733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23059826.

The product of its digits is 12096, while the sum is 34.

The square root of 161418733 is about 12705.0672174530. The cubic root of 161418733 is about 544.4834012833.

The spelling of 161418733 in words is "one hundred sixty-one million, four hundred eighteen thousand, seven hundred thirty-three".