161555232 has 24 divisors (see below), whose sum is σ = 424082736. Its totient is φ = 53851712.

The previous prime is 161555231. The next prime is 161555239. The reversal of 161555232 is 232555161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×161555232² = 52200185973147648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161555232.

It is not an unprimeable number, because it can be changed into a prime (161555231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841338 + ... + 841529.

It is an arithmetic number, because the mean of its divisors is an integer number (17670114).

Almost surely, 2^161555232 is an apocalyptic number.

161555232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161555232 is an abundant number, since it is smaller than the sum of its proper divisors (262527504).

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

161555232 is a wasteful number, since it uses less digits than its factorization.

161555232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682880 (or 1682872 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 161555232 is about 12710.4379153513. The cubic root of 161555232 is about 544.6368334965.

The spelling of 161555232 in words is "one hundred sixty-one million, five hundred fifty-five thousand, two hundred thirty-two".