161842506 has 32 divisors (see below), whose sum is σ = 381861888. Its totient is φ = 44748720.

The previous prime is 161842451. The next prime is 161842507. The reversal of 161842506 is 605248161.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161842507) 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, 60850 + ... + 63453.

It is an arithmetic number, because the mean of its divisors is an integer number (11933184).

Almost surely, 2^161842506 is an apocalyptic number.

161842506 is an abundant number, since it is smaller than the sum of its proper divisors (220019382).

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

161842506 is a wasteful number, since it uses less digits than its factorization.

161842506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124346.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 161842506 is about 12721.7336082784. The cubic root of 161842506 is about 544.9594627987.

The spelling of 161842506 in words is "one hundred sixty-one million, eight hundred forty-two thousand, five hundred six".