161547812 has 6 divisors (see below), whose sum is σ = 282708678. Its totient is φ = 80773904.

The previous prime is 161547779. The next prime is 161547817. The reversal of 161547812 is 218745161.

It can be written as a sum of positive squares in only one way, i.e., 84529636 + 77018176 = 9194^2 + 8776^2 .

It is not an unprimeable number, because it can be changed into a prime (161547817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20193473 + ... + 20193480.

It is an arithmetic number, because the mean of its divisors is an integer number (47118113).

Almost surely, 2^161547812 is an apocalyptic number.

It is an amenable number.

161547812 is a deficient number, since it is larger than the sum of its proper divisors (121160866).

161547812 is a wasteful number, since it uses less digits than its factorization.

161547812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40386957 (or 40386955 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 161547812 is about 12710.1460259117. The cubic root of 161547812 is about 544.6284952394.

The spelling of 161547812 in words is "one hundred sixty-one million, five hundred forty-seven thousand, eight hundred twelve".