161011730 has 48 divisors (see below), whose sum is σ = 330632064. Its totient is φ = 55983840.

The previous prime is 161011729. The next prime is 161011751. The reversal of 161011730 is 37110161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56807 + ... + 59573.

It is an arithmetic number, because the mean of its divisors is an integer number (6888168).

Almost surely, 2^161011730 is an apocalyptic number.

161011730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161011730 is an abundant number, since it is smaller than the sum of its proper divisors (169620334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161011730 is a wasteful number, since it uses less digits than its factorization.

161011730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 161011730 is about 12689.0397587840. The cubic root of 161011730 is about 544.0253939451.

Adding to 161011730 its reverse (37110161), we get a palindrome (198121891).

The spelling of 161011730 in words is "one hundred sixty-one million, eleven thousand, seven hundred thirty".