161651530 has 16 divisors (see below), whose sum is σ = 292136544. Its totient is φ = 64402000.

The previous prime is 161651527. The next prime is 161651533. The reversal of 161651530 is 35156161.

161651530 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161651527) and next prime (161651533).

It is a super-2 number, since 2×161651530² = 52262434302681800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161651533) 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 7 ways as a sum of consecutive naturals, for example, 29692 + ... + 34711.

It is an arithmetic number, because the mean of its divisors is an integer number (18258534).

Almost surely, 2^161651530 is an apocalyptic number.

161651530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161651530 is a deficient number, since it is larger than the sum of its proper divisors (130485014).

161651530 is a wasteful number, since it uses less digits than its factorization.

161651530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64661.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 161651530 is about 12714.2254974497. The cubic root of 161651530 is about 544.7450256399.

The spelling of 161651530 in words is "one hundred sixty-one million, six hundred fifty-one thousand, five hundred thirty".