161842749 has 4 divisors (see below), whose sum is σ = 215790336. Its totient is φ = 107895164.

The previous prime is 161842729. The next prime is 161842777. The reversal of 161842749 is 947248161.

161842749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 161842749 - 2¹² = 161838653 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161842749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161842729) 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, 26973789 + ... + 26973794.

It is an arithmetic number, because the mean of its divisors is an integer number (53947584).

Almost surely, 2^161842749 is an apocalyptic number.

It is an amenable number.

161842749 is a deficient number, since it is larger than the sum of its proper divisors (53947587).

161842749 is an equidigital number, since it uses as much as digits as its factorization.

161842749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53947586.

The product of its digits is 96768, while the sum is 42.

The square root of 161842749 is about 12721.7431588600. The cubic root of 161842749 is about 544.9597355434.

The spelling of 161842749 in words is "one hundred sixty-one million, eight hundred forty-two thousand, seven hundred forty-nine".