161551132 has 6 divisors (see below), whose sum is σ = 282714488. Its totient is φ = 80775564.

The previous prime is 161551123. The next prime is 161551147. The reversal of 161551132 is 231155161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161551097 and 161551106.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 20193888 + ... + 20193895.

Almost surely, 2^161551132 is an apocalyptic number.

It is an amenable number.

161551132 is a deficient number, since it is larger than the sum of its proper divisors (121163356).

161551132 is a wasteful number, since it uses less digits than its factorization.

161551132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40387787 (or 40387785 counting only the distinct ones).

The product of its digits is 900, while the sum is 25.

The square root of 161551132 is about 12710.2766295624. The cubic root of 161551132 is about 544.6322261353.

The spelling of 161551132 in words is "one hundred sixty-one million, five hundred fifty-one thousand, one hundred thirty-two".