161651832 has 16 divisors (see below), whose sum is σ = 404129640. Its totient is φ = 53883936.

The previous prime is 161651821. The next prime is 161651839. The reversal of 161651832 is 238156161.

It is a super-2 number, since 2×161651832² = 52262629577912448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161651793 and 161651802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161651839) 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, 3367723 + ... + 3367770.

Almost surely, 2^161651832 is an apocalyptic number.

161651832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161651832 is an abundant number, since it is smaller than the sum of its proper divisors (242477808).

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

161651832 is a wasteful number, since it uses less digits than its factorization.

161651832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735502 (or 6735498 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 161651832 is about 12714.2373739049. The cubic root of 161651832 is about 544.7453648735.

The spelling of 161651832 in words is "one hundred sixty-one million, six hundred fifty-one thousand, eight hundred thirty-two".