161543985 has 16 divisors (see below), whose sum is σ = 272074560. Its totient is φ = 81622080.

The previous prime is 161543981. The next prime is 161544017. The reversal of 161543985 is 589345161.

161543985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161543985 - 2² = 161543981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161543981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283126 + ... + 283695.

It is an arithmetic number, because the mean of its divisors is an integer number (17004660).

Almost surely, 2^161543985 is an apocalyptic number.

161543985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161543985 is a deficient number, since it is larger than the sum of its proper divisors (110530575).

161543985 is a wasteful number, since it uses less digits than its factorization.

161543985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566848.

The product of its digits is 129600, while the sum is 42.

The square root of 161543985 is about 12709.9954760023. The cubic root of 161543985 is about 544.6241945318.

The spelling of 161543985 in words is "one hundred sixty-one million, five hundred forty-three thousand, nine hundred eighty-five".