161515105 has 16 divisors (see below), whose sum is σ = 206611200. Its totient is φ = 120856320.

The previous prime is 161515097. The next prime is 161515111. The reversal of 161515105 is 501515161.

It is not a de Polignac number, because 161515105 - 2³ = 161515097 is a prime.

It is a super-2 number, since 2×161515105² = 52174258286322050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161515105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3256 + ... + 18265.

It is an arithmetic number, because the mean of its divisors is an integer number (12913200).

Almost surely, 2^161515105 is an apocalyptic number.

It is an amenable number.

161515105 is a deficient number, since it is larger than the sum of its proper divisors (45096095).

161515105 is a wasteful number, since it uses less digits than its factorization.

161515105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21624.

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

The square root of 161515105 is about 12708.8593115197. The cubic root of 161515105 is about 544.5917375632.

The spelling of 161515105 in words is "one hundred sixty-one million, five hundred fifteen thousand, one hundred five".