161285615 has 4 divisors (see below), whose sum is σ = 193542744. Its totient is φ = 129028488.

The previous prime is 161285611. The next prime is 161285633. The reversal of 161285615 is 516582161.

It is a happy number.

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 161285615 - 2² = 161285611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161285611) 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, 16128557 + ... + 16128566.

It is an arithmetic number, because the mean of its divisors is an integer number (48385686).

Almost surely, 2^161285615 is an apocalyptic number.

161285615 is a deficient number, since it is larger than the sum of its proper divisors (32257129).

161285615 is an equidigital number, since it uses as much as digits as its factorization.

161285615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32257128.

The product of its digits is 14400, while the sum is 35.

The square root of 161285615 is about 12699.8273610313. The cubic root of 161285615 is about 544.3336861635. Note that the first 3 decimals are identical.

The spelling of 161285615 in words is "one hundred sixty-one million, two hundred eighty-five thousand, six hundred fifteen".