161533115 has 4 divisors (see below), whose sum is σ = 193839744. Its totient is φ = 129226488.

The previous prime is 161533109. The next prime is 161533121. The reversal of 161533115 is 511335161.

161533115 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 an interprime number because it is at equal distance from previous prime (161533109) and next prime (161533121).

It is a cyclic number.

It is not a de Polignac number, because 161533115 - 2⁸ = 161532859 is a prime.

It is a Duffinian 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, 16153307 + ... + 16153316.

It is an arithmetic number, because the mean of its divisors is an integer number (48459936).

Almost surely, 2^161533115 is an apocalyptic number.

161533115 is a deficient number, since it is larger than the sum of its proper divisors (32306629).

161533115 is an equidigital number, since it uses as much as digits as its factorization.

161533115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32306628.

The product of its digits is 1350, while the sum is 26.

The square root of 161533115 is about 12709.5678526062. The cubic root of 161533115 is about 544.6119786684.

Adding to 161533115 its reverse (511335161), we get a palindrome (672868276).

The spelling of 161533115 in words is "one hundred sixty-one million, five hundred thirty-three thousand, one hundred fifteen".