161511055 has 4 divisors (see below), whose sum is σ = 193813272. Its totient is φ = 129208840.

The previous prime is 161511029. The next prime is 161511073. The reversal of 161511055 is 550115161.

161511055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 161511055 - 2⁷ = 161510927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16151101 + ... + 16151110.

It is an arithmetic number, because the mean of its divisors is an integer number (48453318).

Almost surely, 2^161511055 is an apocalyptic number.

161511055 is a deficient number, since it is larger than the sum of its proper divisors (32302217).

161511055 is an equidigital number, since it uses as much as digits as its factorization.

161511055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32302216.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 161511055 is about 12708.6999728532. The cubic root of 161511055 is about 544.5871856361.

The spelling of 161511055 in words is "one hundred sixty-one million, five hundred eleven thousand, fifty-five".