161159815 has 8 divisors (see below), whose sum is σ = 200060640. Its totient is φ = 124481952.

The previous prime is 161159773. The next prime is 161159819. The reversal of 161159815 is 518951161.

161159815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161159815 - 2¹¹ = 161157767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161159819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555579 + ... + 555868.

It is an arithmetic number, because the mean of its divisors is an integer number (25007580).

Almost surely, 2^161159815 is an apocalyptic number.

161159815 is a deficient number, since it is larger than the sum of its proper divisors (38900825).

161159815 is a wasteful number, since it uses less digits than its factorization.

161159815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111481.

The product of its digits is 10800, while the sum is 37.

The square root of 161159815 is about 12694.8735716430. The cubic root of 161159815 is about 544.1921257209.

The spelling of 161159815 in words is "one hundred sixty-one million, one hundred fifty-nine thousand, eight hundred fifteen".