161562011 has 4 divisors (see below), whose sum is σ = 173989872. Its totient is φ = 149134152.

The previous prime is 161561993. The next prime is 161562013. The reversal of 161562011 is 110265161.

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

It is a cyclic number.

It is not a de Polignac number, because 161562011 - 2²⁶ = 94453147 is a prime.

It is a super-2 number, since 2×161562011² = 52204566796728242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161562013) 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, 6213911 + ... + 6213936.

It is an arithmetic number, because the mean of its divisors is an integer number (43497468).

Almost surely, 2^161562011 is an apocalyptic number.

161562011 is a deficient number, since it is larger than the sum of its proper divisors (12427861).

161562011 is a wasteful number, since it uses less digits than its factorization.

161562011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12427860.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 161562011 is about 12710.7045831457. The cubic root of 161562011 is about 544.6444512039.

The spelling of 161562011 in words is "one hundred sixty-one million, five hundred sixty-two thousand, eleven".