161506106 has 4 divisors (see below), whose sum is σ = 242259162. Its totient is φ = 80753052.

The previous prime is 161506097. The next prime is 161506109. The reversal of 161506106 is 601605161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 85729081 + 75777025 = 9259^2 + 8705^2 .

It is not an unprimeable number, because it can be changed into a prime (161506109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40376525 + ... + 40376528.

Almost surely, 2^161506106 is an apocalyptic number.

161506106 is a deficient number, since it is larger than the sum of its proper divisors (80753056).

161506106 is an equidigital number, since it uses as much as digits as its factorization.

161506106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80753055.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 161506106 is about 12708.5052622250. The cubic root of 161506106 is about 544.5816231902.

The spelling of 161506106 in words is "one hundred sixty-one million, five hundred six thousand, one hundred six".