161813752 has 16 divisors (see below), whose sum is σ = 321248160. Its totient is φ = 76147584.

The previous prime is 161813737. The next prime is 161813759. The reversal of 161813752 is 257318161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161813759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594768 + ... + 595039.

It is an arithmetic number, because the mean of its divisors is an integer number (20078010).

Almost surely, 2^161813752 is an apocalyptic number.

It is an amenable number.

161813752 is a deficient number, since it is larger than the sum of its proper divisors (159434408).

161813752 is a wasteful number, since it uses less digits than its factorization.

161813752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189830 (or 1189826 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 161813752 is about 12720.6034448056. The cubic root of 161813752 is about 544.9271871976.

The spelling of 161813752 in words is "one hundred sixty-one million, eight hundred thirteen thousand, seven hundred fifty-two".